Im usually hesitant to download apps that claim to be addictive. Because, most of the time they are not. In fact, most of the time they are garbage. But, Tri surpassed my expectations and I have become addicted to the game. It's a puzzle game that really challenges you to think and definitely makes you put your skills to the test. The levels increase in difficulty and makes it more of a challenge. I also enjoyed the Tabletop Mode which is faster and allows up to 4 people to play. It's much more fun when you are beating your friends or complete strangers. I highly recommend you give this app a try.