From The Odin Project's curriculum: https://www.theodinproject.com/courses/ruby-programming

Play Tic Tac Toe (hotseat): https://repl.it/@BenFowler/Tic-Tac-Toe

Play Mastermind (computer player is probably unbeatable if you play as codemaker): https://repl.it/@BenFowler/Mastermind

Play Hangman: https://repl.it/@BenFowler/Hangman