The Rainbow Block is one of the most powerful tools in Color Block Jam. It becomes available starting from Level 200 and requires 10 wins to activate.

When it activates, it will randomly choose one block on the board and turn it into a passable one, allowing it to go through gates regardless of its original color.

This effect can help you clear tricky sections of the board and progress through levels with fewer moves. Planning ahead and triggering the Rainbow Block at the right time can open up new strategies and make solving complex gate puzzles much easier.