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+checksum = "5a6580f308b1fad9207618087a65c04e7a10bc77e02c8e84e9b00dd4b12fa0bb"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-sys"
+version = "0.60.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2f500e4d28234f72040990ec9d39e3a6b950f9f22d3dba18416c35882612bcb"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.53.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4945f9f551b88e0d65f3db0bc25c33b8acea4d9e41163edf90dcd0b19f9069f3"
+dependencies = [
+ "windows-link",
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.53.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9d8416fa8b42f5c947f8482c43e7d89e73a173cead56d044f6a56104a6d1b53"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.53.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9d782e804c2f632e395708e99a94275910eb9100b2114651e04744e9b125006"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.53.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "960e6da069d81e09becb0ca57a65220ddff016ff2d6af6a223cf372a506593a3"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.53.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa7359d10048f68ab8b09fa71c3daccfb0e9b559aed648a8f95469c27057180c"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.53.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e7ac75179f18232fe9c285163565a57ef8d3c89254a30685b57d83a38d326c2"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.53.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c3842cdd74a865a8066ab39c8a7a473c0778a3f29370b5fd6b4b9aa7df4a499"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.53.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ffa179e2d07eee8ad8f57493436566c7cc30ac536a3379fdf008f47f6bb7ae1"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.53.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d6bbff5f0aada427a1e5a6da5f1f98158182f26556f345ac9e04d36d0ebed650"
+
+[[package]]
+name = "wit-bindgen"
+version = "0.46.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f17a85883d4e6d00e8a97c586de764dabcc06133f7f1d55dce5cdc070ad7fe59"
+
+[[package]]
+name = "writeable"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9edde0db4769d2dc68579893f2306b26c6ecfbe0ef499b013d731b7b9247e0b9"
+
+[[package]]
+name = "yoke"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72d6e5c6afb84d73944e5cedb052c4680d5657337201555f9f2a16b7406d4954"
+dependencies = [
+ "stable_deref_trait",
+ "yoke-derive",
+ "zerofrom",
+]
+
+[[package]]
+name = "yoke-derive"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b659052874eb698efe5b9e8cf382204678a0086ebf46982b79d6ca3182927e5d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.8.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0894878a5fa3edfd6da3f88c4805f4c8558e2b996227a3d864f47fe11e38282c"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88d2b8d9c68ad2b9e4340d7832716a4d21a22a1154777ad56ea55c51a9cf3831"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "zerofrom"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50cc42e0333e05660c3587f3bf9d0478688e15d870fab3346451ce7f8c9fbea5"
+dependencies = [
+ "zerofrom-derive",
+]
+
+[[package]]
+name = "zerofrom-derive"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d71e5d6e06ab090c67b5e44993ec16b72dcbaabc526db883a360057678b48502"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
+name = "zerotrie"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a59c17a5562d507e4b54960e8569ebee33bee890c70aa3fe7b97e85a9fd7851"
+dependencies = [
+ "displaydoc",
+ "yoke",
+ "zerofrom",
+]
+
+[[package]]
+name = "zerovec"
+version = "0.11.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c28719294829477f525be0186d13efa9a3c602f7ec202ca9e353d310fb9a002"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eadce39539ca5cb3985590102671f2567e659fca9666581ad3411d59207951f3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/src/ruby-gem/Cargo.toml b/src/ruby-gem/Cargo.toml
new file mode 100644
index 00000000..dd1c93cb
--- /dev/null
+++ b/src/ruby-gem/Cargo.toml
@@ -0,0 +1,12 @@
+# This Cargo.toml is here to let externals tools (IDEs, etc.) know that this is
+# a Rust project. Your extensions dependencies should be added to the Cargo.toml
+# in the ext/ directory.
+
+[workspace]
+members = ["./ext/twips"]
+resolver = "2"
+
+[workspace.package]
+version = "0.1.0"
+license = "MPL-2.0"
+edition = "2021"
diff --git a/src/ruby-gem/Gemfile b/src/ruby-gem/Gemfile
new file mode 100644
index 00000000..c4b89e37
--- /dev/null
+++ b/src/ruby-gem/Gemfile
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+# Specify your gem's dependencies in twsearch.gemspec
+gemspec
+
+gem "debug"
+gem "gem-release"
+gem "rake", "~> 13.3"
+gem "rake-compiler", "~> 1.3"
+gem "rspec", "~> 3.13"
+gem "rubocop", "~> 1.81"
+gem "rubocop-rake", "~> 0.7"
+gem "rubocop-rspec", "~> 3.7"
diff --git a/src/ruby-gem/Gemfile.lock b/src/ruby-gem/Gemfile.lock
new file mode 100644
index 00000000..ea4d5176
--- /dev/null
+++ b/src/ruby-gem/Gemfile.lock
@@ -0,0 +1,150 @@
+PATH
+  remote: .
+  specs:
+    twips (0.0.1)
+      rb_sys (~> 0.9.117)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.3)
+    date (3.5.0)
+    debug (1.11.0)
+      irb (~> 1.10)
+      reline (>= 0.3.8)
+    diff-lcs (1.6.2)
+    erb (6.0.0)
+    gem-release (2.2.4)
+    io-console (0.8.1)
+    irb (1.15.3)
+      pp (>= 0.6.0)
+      rdoc (>= 4.0.0)
+      reline (>= 0.4.2)
+    json (2.17.1)
+    language_server-protocol (3.17.0.5)
+    lint_roller (1.1.0)
+    parallel (1.27.0)
+    parser (3.3.10.0)
+      ast (~> 2.4.1)
+      racc
+    pp (0.6.3)
+      prettyprint
+    prettyprint (0.2.0)
+    prism (1.6.0)
+    psych (5.2.6)
+      date
+      stringio
+    racc (1.8.1)
+    rainbow (3.1.1)
+    rake (13.3.1)
+    rake-compiler (1.3.0)
+      rake
+    rake-compiler-dock (1.10.0)
+    rb_sys (0.9.119)
+      rake-compiler-dock (= 1.10.0)
+    rdoc (6.17.0)
+      erb
+      psych (>= 4.0.0)
+      tsort
+    regexp_parser (2.11.3)
+    reline (0.6.3)
+      io-console (~> 0.5)
+    rspec (3.13.2)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.6)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.5)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.7)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.6)
+    rubocop (1.81.7)
+      json (~> 2.3)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.1.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 2.9.3, < 3.0)
+      rubocop-ast (>= 1.47.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 4.0)
+    rubocop-ast (1.48.0)
+      parser (>= 3.3.7.2)
+      prism (~> 1.4)
+    rubocop-rake (0.7.1)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.72.1)
+    rubocop-rspec (3.8.0)
+      lint_roller (~> 1.1)
+      rubocop (~> 1.81)
+    ruby-progressbar (1.13.0)
+    stringio (3.1.9)
+    tsort (0.2.0)
+    unicode-display_width (3.2.0)
+      unicode-emoji (~> 4.1)
+    unicode-emoji (4.1.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  debug
+  gem-release
+  rake (~> 13.3)
+  rake-compiler (~> 1.3)
+  rspec (~> 3.13)
+  rubocop (~> 1.81)
+  rubocop-rake (~> 0.7)
+  rubocop-rspec (~> 3.7)
+  twips!
+
+CHECKSUMS
+  ast (2.4.3) sha256=954615157c1d6a382bc27d690d973195e79db7f55e9765ac7c481c60bdb4d383
+  date (3.5.0) sha256=5e74fd6c04b0e65d97ad4f3bb5cb2d8efb37f386cc848f46310b4593ffc46ee5
+  debug (1.11.0) sha256=1425db64cfa0130c952684e3dc974985be201dd62899bf4bbe3f8b5d6cf1aef2
+  diff-lcs (1.6.2) sha256=9ae0d2cba7d4df3075fe8cd8602a8604993efc0dfa934cff568969efb1909962
+  erb (6.0.0) sha256=2730893f9d8c9733f16cab315a4e4b71c1afa9cabc1a1e7ad1403feba8f52579
+  gem-release (2.2.4) sha256=2f11124c1580c811507c3b47e875e420cf3ed792a98105b49df11971e6e94db3
+  io-console (0.8.1) sha256=1e15440a6b2f67b6ea496df7c474ed62c860ad11237f29b3bd187f054b925fcb
+  irb (1.15.3) sha256=4349edff1efa7ff7bfd34cb9df74a133a588ba88c2718098b3b4468b81184aaa
+  json (2.17.1) sha256=e0e4824541336a44915436f53e7ea74c687314fb8f88080fa1456f6a34ead92e
+  language_server-protocol (3.17.0.5) sha256=fd1e39a51a28bf3eec959379985a72e296e9f9acfce46f6a79d31ca8760803cc
+  lint_roller (1.1.0) sha256=2c0c845b632a7d172cb849cc90c1bce937a28c5c8ccccb50dfd46a485003cc87
+  parallel (1.27.0) sha256=4ac151e1806b755fb4e2dc2332cbf0e54f2e24ba821ff2d3dcf86bf6dc4ae130
+  parser (3.3.10.0) sha256=ce3587fa5cc55a88c4ba5b2b37621b3329aadf5728f9eafa36bbd121462aabd6
+  pp (0.6.3) sha256=2951d514450b93ccfeb1df7d021cae0da16e0a7f95ee1e2273719669d0ab9df6
+  prettyprint (0.2.0) sha256=2bc9e15581a94742064a3cc8b0fb9d45aae3d03a1baa6ef80922627a0766f193
+  prism (1.6.0) sha256=bfc0281a81718c4872346bc858dc84abd3a60cae78336c65ad35c8fbff641c6b
+  psych (5.2.6) sha256=814328aa5dcb6d604d32126a20bc1cbcf05521a5b49dbb1a8b30a07e580f316e
+  racc (1.8.1) sha256=4a7f6929691dbec8b5209a0b373bc2614882b55fc5d2e447a21aaa691303d62f
+  rainbow (3.1.1) sha256=039491aa3a89f42efa1d6dec2fc4e62ede96eb6acd95e52f1ad581182b79bc6a
+  rake (13.3.1) sha256=8c9e89d09f66a26a01264e7e3480ec0607f0c497a861ef16063604b1b08eb19c
+  rake-compiler (1.3.0) sha256=eec272ef6d4dad27b36f5cdcf5b9ee4df2193751f4082b095f981ebf9cdf4127
+  rake-compiler-dock (1.10.0) sha256=dd62ee19df2a185a3315697e560cfa8cc9129901332152851e023fab0e94bf11
+  rb_sys (0.9.119) sha256=64393fa148e402e1b79b64496d2aabfc7df79da6b822b8bb48dc1141eaf40b4b
+  rdoc (6.17.0) sha256=0f50d4e568fc98195f9bb155a9e8dff6c7feabfb515fb22ef6df1d12ad5a02b7
+  regexp_parser (2.11.3) sha256=ca13f381a173b7a93450e53459075c9b76a10433caadcb2f1180f2c741fc55a4
+  reline (0.6.3) sha256=1198b04973565b36ec0f11542ab3f5cfeeec34823f4e54cebde90968092b1835
+  rspec (3.13.2) sha256=206284a08ad798e61f86d7ca3e376718d52c0bc944626b2349266f239f820587
+  rspec-core (3.13.6) sha256=a8823c6411667b60a8bca135364351dda34cd55e44ff94c4be4633b37d828b2d
+  rspec-expectations (3.13.5) sha256=33a4d3a1d95060aea4c94e9f237030a8f9eae5615e9bd85718fe3a09e4b58836
+  rspec-mocks (3.13.7) sha256=0979034e64b1d7a838aaaddf12bf065ea4dc40ef3d4c39f01f93ae2c66c62b1c
+  rspec-support (3.13.6) sha256=2e8de3702427eab064c9352fe74488cc12a1bfae887ad8b91cba480ec9f8afb2
+  rubocop (1.81.7) sha256=6fb5cc298c731691e2a414fe0041a13eb1beed7bab23aec131da1bcc527af094
+  rubocop-ast (1.48.0) sha256=22df9bbf3f7a6eccde0fad54e68547ae1e2a704bf8719e7c83813a99c05d2e76
+  rubocop-rake (0.7.1) sha256=3797f2b6810c3e9df7376c26d5f44f3475eda59eb1adc38e6f62ecf027cbae4d
+  rubocop-rspec (3.8.0) sha256=28440dccb3f223a9938ca1f946bd3438275b8c6c156dab909e2cb8bc424cab33
+  ruby-progressbar (1.13.0) sha256=80fc9c47a9b640d6834e0dc7b3c94c9df37f08cb072b7761e4a71e22cff29b33
+  stringio (3.1.9) sha256=c111af13d3a73eab96a3bc2655ecf93788d13d28cb8e25c1dcbff89ace885121
+  tsort (0.2.0) sha256=9650a793f6859a43b6641671278f79cfead60ac714148aabe4e3f0060480089f
+  twips (0.0.1)
+  unicode-display_width (3.2.0) sha256=0cdd96b5681a5949cdbc2c55e7b420facae74c4aaf9a9815eee1087cb1853c42
+  unicode-emoji (4.1.0) sha256=4997d2d5df1ed4252f4830a9b6e86f932e2013fbff2182a9ce9ccabda4f325a5
+
+BUNDLED WITH
+  4.0.1
diff --git a/src/ruby-gem/Rakefile b/src/ruby-gem/Rakefile
new file mode 100644
index 00000000..72999143
--- /dev/null
+++ b/src/ruby-gem/Rakefile
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
+
+RSpec::Core::RakeTask.new(:spec)
+
+require "rubocop/rake_task"
+
+RuboCop::RakeTask.new
+
+require "rb_sys/extensiontask"
+
+desc "Build extension"
+task build: :compile
+
+GEMSPEC = Gem::Specification.load("twips.gemspec")
+
+RbSys::ExtensionTask.new("twips-rb", GEMSPEC) do |ext|
+  ext.lib_dir = "lib/twips"
+end
+
+task default: %i[compile spec rubocop]
diff --git a/src/ruby-gem/bin/console b/src/ruby-gem/bin/console
new file mode 100755
index 00000000..b83cb7c4
--- /dev/null
+++ b/src/ruby-gem/bin/console
@@ -0,0 +1,15 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "bundler/setup"
+require "twips"
+
+# You can add fixtures and/or initialization code here to make experimenting
+# with your gem easier. You can also use a different console, if you like.
+
+# (If you use this, don't forget to add pry to your Gemfile!)
+# require "pry"
+# Pry.start
+
+require "irb"
+IRB.start(__FILE__)
diff --git a/src/ruby-gem/ext/twips/Cargo.toml b/src/ruby-gem/ext/twips/Cargo.toml
new file mode 100644
index 00000000..c58bf5ff
--- /dev/null
+++ b/src/ruby-gem/ext/twips/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "twips-rb"
+version.workspace = true
+license.workspace = true
+edition.workspace = true
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+magnus = { version = "0.8.2" }
+twips = { path = "../../../lib" }
diff --git a/src/ruby-gem/ext/twips/extconf.rb b/src/ruby-gem/ext/twips/extconf.rb
new file mode 100644
index 00000000..6ea8f2ad
--- /dev/null
+++ b/src/ruby-gem/ext/twips/extconf.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+require "mkmf"
+require "rb_sys/mkmf"
+
+# https://github.com/oxidize-rb/rb-sys/tree/main/gem
+create_rust_makefile("twips/twips_rb")
diff --git a/src/ruby-gem/ext/twips/src/lib.rs b/src/ruby-gem/ext/twips/src/lib.rs
new file mode 100644
index 00000000..e8389025
--- /dev/null
+++ b/src/ruby-gem/ext/twips/src/lib.rs
@@ -0,0 +1,53 @@
+use std::str::FromStr;
+
+use magnus::{function, prelude::*, Error, Ruby};
+
+use twips::scramble::{random_scramble_for_event, derive_scramble_for_event_seeded, Event, DerivationSeed, DerivationSalt};
+
+fn rb_random_scramble_for_event(ruby: &Ruby, event_str: String) -> Result<String, Error> {
+    let event = Event::try_from(event_str.as_str())
+        .map_err(|e| Error::new(ruby.exception_arg_error(), e.description))?;
+
+    random_scramble_for_event(event)
+        .map(|scramble| scramble.to_string())
+        .map_err(|e| Error::new(ruby.exception_runtime_error(), e.description))
+}
+
+fn rb_derive_scramble_for_event(ruby: &Ruby, hex_derivation_seed_str: String, derivation_salt_hierarchy_str: String, subevent_str: String) -> Result<String, Error> {
+    let subevent = Event::try_from(subevent_str.as_str())
+        .map_err(|e| Error::new(ruby.exception_arg_error(), e.description))?;
+
+    let derivation_seed = DerivationSeed::from_str(&hex_derivation_seed_str)
+        .map_err(|e| Error::new(ruby.exception_arg_error(), e))?;
+
+    let hierarchy = if derivation_salt_hierarchy_str.is_empty() {
+        vec![]
+    } else {
+        derivation_salt_hierarchy_str
+            .split("/")
+            .map(DerivationSalt::from_str)
+            .collect::<Result<Vec<DerivationSalt>, String>>()
+            .map_err(|e| Error::new(ruby.exception_arg_error(), e))?
+    };
+
+    derive_scramble_for_event_seeded(&derivation_seed, &hierarchy, subevent)
+        .map(|scramble| scramble.to_string())
+        .map_err(|e| Error::new(ruby.exception_runtime_error(), e))
+}
+
+#[magnus::init]
+fn init(ruby: &Ruby) -> Result<(), Error> {
+    let module = ruby.define_module("Twips")?;
+
+    module.define_singleton_method(
+        "random_scramble_for_event",
+        function!(rb_random_scramble_for_event, 1),
+    )?;
+
+    module.define_singleton_method(
+        "derive_scramble_for_event",
+        function!(rb_derive_scramble_for_event, 3),
+    )?;
+
+    Ok(())
+}
diff --git a/src/ruby-gem/lib/twips.rb b/src/ruby-gem/lib/twips.rb
new file mode 100644
index 00000000..003a9634
--- /dev/null
+++ b/src/ruby-gem/lib/twips.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+require_relative "twips/version"
+require_relative "twips/twips_rb"
+
+##
+# Top level module.
+#
+# Methods defined in ext/twips/src/lib.rs
+#
+# Ex Twips.random_scramble_for_event(event_id) => String
+#
+module Twips
+end
diff --git a/src/ruby-gem/lib/twips/version.rb b/src/ruby-gem/lib/twips/version.rb
new file mode 100644
index 00000000..358e6311
--- /dev/null
+++ b/src/ruby-gem/lib/twips/version.rb
@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+module Twips
+  VERSION = "0.0.1"
+end
diff --git a/src/ruby-gem/sig/twips.rbs b/src/ruby-gem/sig/twips.rbs
new file mode 100644
index 00000000..779e4fb9
--- /dev/null
+++ b/src/ruby-gem/sig/twips.rbs
@@ -0,0 +1,7 @@
+module Twips
+  VERSION: String
+  # See the writing guide of rbs: https://github.com/ruby/rbs#guides
+
+  def self.random_scramble_for_event: (String) -> String
+  def self.derive_scramble_for_event: (String, String, String) -> String
+end
diff --git a/src/ruby-gem/spec/spec_helper.rb b/src/ruby-gem/spec/spec_helper.rb
new file mode 100644
index 00000000..599d37c6
--- /dev/null
+++ b/src/ruby-gem/spec/spec_helper.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require "twips"
+
+RSpec.configure do |config|
+  # Enable flags like --only-failures and --next-failure
+  config.example_status_persistence_file_path = ".rspec_status"
+
+  # Disable RSpec exposing methods globally on `Module` and `main`
+  config.disable_monkey_patching!
+
+  config.expect_with :rspec do |c|
+    c.syntax = :expect
+  end
+end
diff --git a/src/ruby-gem/spec/twips_spec.rb b/src/ruby-gem/spec/twips_spec.rb
new file mode 100644
index 00000000..eef0fab0
--- /dev/null
+++ b/src/ruby-gem/spec/twips_spec.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+RSpec.describe Twips do
+  it "has a version number" do
+    expect(described_class::VERSION).not_to be_nil
+  end
+
+  describe ".random_scramble_for_event" do
+    subject(:random_scramble_for_event) { described_class.random_scramble_for_event(event_id) }
+
+    context "with 333" do
+      let(:event_id) { "333" }
+
+      it { is_expected.not_to be_nil }
+    end
+  end
+end
diff --git a/src/ruby-gem/twips.gemspec b/src/ruby-gem/twips.gemspec
new file mode 100644
index 00000000..a0b18866
--- /dev/null
+++ b/src/ruby-gem/twips.gemspec
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require_relative "lib/twips/version"
+
+Gem::Specification.new do |spec|
+  spec.name = "twips"
+  spec.version = Twips::VERSION
+  spec.authors = ["Lucas Garron", "Tom Rokicki", "Gregor Billing"]
+
+  spec.summary = "Ruby scramble generation using twips"
+  spec.description = "Ruby scramble generation using twips."
+  spec.homepage = "https://github.com/cubing/twips"
+  spec.required_ruby_version = ">= 3.0.0"
+  spec.required_rubygems_version = ">= 3.4.6"
+
+  spec.metadata["bug_tracker_uri"] = "https://github.com/cubing/twips/issues"
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = "https://github.com/cubing/twips"
+
+  spec.files = Dir["ext/**/*"] +
+               Dir["lib/**/*.rb"] +
+               Dir["sig/twips.rbs"] +
+               Dir["twips.gemspec"]
+  spec.require_paths = ["lib"]
+  spec.extensions = ["ext/twips/extconf.rb"]
+
+  spec.metadata["rubygems_mfa_required"] = "true"
+
+  spec.add_dependency("rb_sys", "~> 0.9.117")
+end