A fun and difficult brain game is System Puzzle. To close the gaps, you can act like an anti-virus. To advance to the next level, you simply need to connect the dots and fill in the blanks.
You can test yourself by playing on one of four levels. Each level includes 60 puzzles. Now is the time to mentally challenge yourself and overcome fatigue.
The difficulty will progressively get harder, but don't give up. As many diamonds as you can will be yours if you persevere. If you like playing this game, you can also play Color Snake 3D Online or Nine Blocks: Block Puzzle Game.
Drag the blocks from the bottom panel to the hole.