Build the blocks

In this game you have 20 blocks, 16 of them can be matched in pairs, 4 blocks are false blocks, they can not form pairs to complicate your gameplay. :-)
You should build 8 solid blocks from 8 pairs of blocks and do it in time less than 100 sec. If you can not do this in less than 100 sec. or if you make a mistake, then the game will over!
To select/deselect a block click on them. Click on a second block you think it can be matched with (probably after some rotation). The second block will be connected to the first selected block.