Yes, Block puzzle can be challenging for several reasons. Firstly, the player is presented with a limited number of blocks that must be arranged in a specific way to fill the available space. This requires the player to think strategically and plan ahead to ensure that each block is placed correctly to avoid running out of space.

Another challenge in Block puzzle is that the player may need to rotate or flip the blocks to fit them into the available space. This adds an extra level of complexity to the game as the player must think spatially and consider all possible orientations of each block.

Additionally, as the player progresses through the game, the shapes of the blocks and the spaces to fill become more complex and difficult to solve. This means that the player must continually adapt their strategy and problem-solving skills to overcome each new challenge.

Overall, Block puzzle is a challenging and rewarding game that can improve a player's spatial reasoning, problem-solving, and strategic thinking skills.