Transport Disks are objects in the Q*Bert franchise. They are colored red, yellow, green and blue. They are used to transport Q*bert back to the top of a structure of blocks. Once a disc is used, it disappears for the rest of the level. The more discs left over when the board is cleared, the more points that are scored.
Faster Harder More Challenging Q*bert introduced discs that would teleport instead of remaining stationary, requiring Q*Bert to time his jumps so he doesn't jump off.