This is a blatant ripp-off of the Palm game Vexed, a series of logic puzzles invented in 1999 by James McCombe and further developed by the Vexed SourceForge Project. It's easy to learn, but hard to master.
 
Object: make all blocks disappear.
 
You can move a block to the left or right, provided the space is free. Gravity will drop a block. If a block ends up directly next to another of the same kind, they both disappear. Once all the blocks are gone, you've solved the level and you'll automatically go to the next one.
 
To do well you should solve a level in no more moves than indicated as 'Par'. Some levels have solutions in less moves than the 'Par' count, but others do not.

 

Vexed Classic, level 1

 

Presented here are 51 level sets, for a total of 3010 puzzles (2955 different, some puzzles are included in more than one set, though the names might differ):

  Unless otherwise noted, the level sets were created by the Vexed Development Team.

 

1 The Classic levels pack was released with the original Vexed, created by James McCombe.
2 The Classic II pack is the challenging follow-on to the Classic levels, created by Steve Haynal.
3 The Variety Pack levels provide a full spectrum of difficulties from easy to hard.
4 The Variety II Pack levels is a continuation of the Variety Pack: from easy to hard.
5 The Children's Pack contains very easy levels meant for children.
6 The Twister levels are difficult. Many of these levels have twists that add challenge.
7 The Confusion Pack is hard! These levels are tricky and require careful planning to solve.
8 The Panic Pack levels are very hard! So hard you'll panic after the first one.
9 The Impossible Pack levels are, well, almost impossible. You need to be Einstein to make it through this game pack!
10-48  are 39 more variety packs (numbered 03 to 41) included with the SourceForge Vexed v2.2 release of June 17, 2006.
49-51  are 3 extra theme packs picked up somewhere (x-Few-Blocks, x-Many-Blocks and x-Solvers), creator unknown.

Solutions to all puzzles are included too, but don't take a peek too quick. It is not said that a given solution is the best possible though most probably are, especially the ones found and provided by Alfred Pfeiffer (there are many, all of them below-par!).