"Color Magic Cards" by "Simple Notion Games" is a game that perfectly captures the spirit of popular 90s card games, with pleasant and intuitive interface. And of course its absolutely free.
Tap the cards to flip them, and find matching cards to remove them from the table, until level is complete.
Beside being good at passing the time, this game also improves Ones logic and memory.
It has different levels. Try them all and set your personal record.
Simple yet interesting and addictive notion, is what makes this game perfect for passing some time.