OpenBlok Alternatives
OpenBlok is described as 'A customizable, cross platform, open-source falling block game, packed with a bunch of features' and is a Puzzle Game in the games category. There are more than 10 games similar to OpenBlok for a variety of platforms, including Android, iPhone, Windows, Linux and Online / Web-based. The best alternative is Hextris, which is both free and Open Source. Other OpenBlok like games are Blockinger, Tetris on a plane, Tetris Blitz and Cuyo.
Tetris-on-a-plane is a simple HTML-based version of Tetris that requires no dependencies. It was built on a plane, as an exercise in getting things done.
Race against the clock in a two-minute blitz to clear lines and rack up points before time runs out. This twist on the famous puzzle game is a must-have on mobile.
Cuyo is a Tetris-style puzzle game for up to two players. The player controls falling blocks of various types which change with each level. For example, in the first level, the player has to connect differently colored cartoon faces to each other.
Quinn is an arcade-style tetromino puzzle game written and designed specifically for Mac OS X. It features a clean, elegant user interface, beautiful graphics, and smooth, subtle animations for fluid gameplay.
Discontinued
The official website is no longer available. Last version, 3.5.7, released on October 2009, can be still downloaded from MacUpdate.
The game is brimming over with riffs and variants on that core mechanic with 20 game modes, dozens of special blocks and items, and 115 levels in the adventure mode alone.
LTris as a tetris clone: differently shaped blocks are falling down the rectangular playing field and can be moved sideways or rotated by 90 degree units with the aim of building lines without gaps which then disappear (causing any block above the deleted line to fall down).
PureBlocks is a minimalist falling blocks game for those who simply want to play.