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.

Complete races to earn rewards from the Season Pass (Image via Roblox) The current Season Pass in this Roblox title can be bought for 399 Robux. It has 31 tiers each in the free and Elite slots.