Block Blast IO is a block puzzle game that combines Tetris and Sudoku components to challenge players. The following elements contribute to the block blast io game's difficulty:

1. Diverse and uneven block layout
The blocks come in a variety of shapes (L, T, I, Z, squares, etc.) and cannot be rotated like Tetris. To score points, arrange them so that they fill a row or column. The major problem is to optimize space; one incorrect move might derail the entire approach.

2. Limited space
The game board is set at 8x8, thus space management is critical. The game ends when there is no more area to add fresh blocks, creating ongoing pressure.

3. Combine numerous blocks at once
The game normally gives you three blocks per turn, and you must think intelligently in order to place them all efficiently. In some circumstances, placing the first block will have a direct impact on your ability to position the other two.

4. Increase difficulty over time
The more you play, the more tough the blocks grow (larger, angular). The game is difficult to "predict"; the excessive randomization makes each round a fresh challenge.