Based on the family favorite card game Uno (rules). Yksi is a browser-based, online multiplayer card game that allows for 2-8 players to fling cards at opponents and destroy friendships, created with Ian Jones for Ludum Dare #40.
Like Uno, you can play a card each turn that matches the numeric value or color of the last played card, with the goal to discard all your cards. Action cards, such as reverse, skip, wild, and +2/+3/+4 also exist. Pronounced "ook-si".