From the publisher's website:
Colorio is a memory game, but not a memory game like you’ve ever played before. Different colors are concealed beneath caps. On a turn a player must remove three of these caps, revealing the colors beneath. They may also replace up to two of them, but only on different colors. Set your opponent up because the first to reveal five of any one color, loses! Colorio is a well built game with a unique twist on the traditional ‘memory match’ concept that will keep you guessing till a player pulls off that fateful cap.