Snippet from the review:
Remember how in elementary school you used to get those colorful blocks that were all squares and rhombuses and different sized triangles, and you could use them to make images of cats and houses and people? In Tangram Attack, you get to take all of those little block pictures and DESTROY THEM.
Meaning you get to slice them apart with your sword/3DS stylus. No tangram blocks were harmed in the making of this game.