All Ensenasoft apps are free from 4/27 to 4/29
Theres about 40 or so (some are lite versions) that are normally priced around $2.
Classic games like mahjong, sudoku, chess,reversi etc.

Example:
http://itunes.apple.com/app/sudoku-s...355840026?mt=8

Just search for Ensenasoft in the app store.