4-Squares (jp.gr.java_conf.myoshii.android.quadsquares) on Google Play
Rule is quiet simple. Move 2x2 squares and create original layout. You can find this is surprisingly difficult.At first, let's randomize the layout. There are two randomize methods. Animation randomization is recommended for beginner. There are also two move modes. In shift-mode, squares can be moved horizontally or vertically. In swap-mode, you can move squares to any places, but not to overlapping places. So swap-mode can not be played with game size 3x3 mode. It's forced to be shift-mode.There are variety option parameters, game size, color number, layout, to control difficulties. Also you can undo the operation maximum 100 steps.If you purchase an upgrade option, you will get no-advertisement, max 10x10 game size, and auto save/restore feature. You can resume the game anytime with this potion.Does the difficulty generated from so simple rule look like something ? Yes, this is a 2D version of Rubik's cube.