Block Jam 3D is a free block matching puzzle game developed by VOODOO for iPhone users. The game requires players to tap on blocks that aren't trapped to unblock them and match three colors to clear them. The objective of the game is to prevent the tray from running out of space while completing the puzzle.

The game is easy to play and provides a great way to sharpen your brain while having fun. The graphics are simple, but the gameplay is addictive and challenging. The game offers different levels of difficulty to suit players of all skill levels. Overall, Block Jam 3D is a fantastic game for puzzle lovers who want to challenge their brain and have a good time.