PureBlocks is described as 'minimalist falling blocks game for those who simply want to play'. There are more than 25 games similar to PureBlocks for a variety of platforms, including Android, Windows, Linux, Online / Web-based and iPhone. The best alternative is Puyo Puyo Champions. It's not free, so if you're looking for a free alternative, you could try NullpoMino or Hextris. Other PureBlocks like games are Quadrapassel (Free, Open Source), Blockinger (Free, Open Source), Tetris Blitz (Freemium) and Cuyo (Free, Open Source).
In Quadrapassel, the GNOME version of Tetris, your goal is to create as many complete horizontal lines as possible. The lines are made from seven different shapes. The shapes fall randomly from the top center of the screen.
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.
1010! Klooni is a free, libre and open source klooni of the original minimalistic puzzle game by Gram Games. Fill Up the Board: Drag the pieces on the board and try to clear as many strips as you can! Beware though, it is not that easy o:)