Shape Shift is a free, ad-supported puzzler, a classic color-matching game played on a grid, but with a couple of twists that make this app stand out.
The setup should look familiar to fans of the genre: you play on a 9-by-7 grid of colored blocks, and the goal is to match up--and take out--adjacent groups of four or more of the same color. In addition to being red, yellow, orange, green, or blue, each block also has a triangle, square, or circle on it, and you can swap any two blocks that share the same shape. The scoring and gameplay include some of the usual matching-puzzle shticks--like chain bonuses and bombs that tick down with every turn you take--but the most intriguing aspect of the game is that you can swap blocks from anywhere on the board, even if they don't trigger a match. This potentially lets you set up huge chains and takes the level of strategy and forethought to a fun, new level. The game also includes a bombless "Zen" mode, and you can remove all ads for a small in-app purchase.
If you're a fan of puzzle games, Shape Shift isn't just another clone and is definitely worth a free download.