If you ever wanted to use SpongeBob, Patrick, and others from the SpongeBob franchise in a Tower Defense game as units and ...

To redeem codes, you first of all need to launch SpongeBob Tower Defense in Roblox. You then need to play through the experience until you reach level 10, ... Image credit: Eurogamer/Krabby Krew.

On the one hand, PART of the Roblox’s SpongeBob Tower Defense Season 3 pass is free. There are items/rewards you can get just by playing the game. No payment is required.