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Back Door is the first track under the adventure Lemon Grabbed.
There are two diamond shaped formations in this map. Bloons come from the back door on the top and moves down to the bottom exit. The bloons split paths when they meet the first diamond and will continue moving straight on the intersection. The second bigger diamond has water space for use.
- Normal: 50 Coins, 1 Gem, 1 Star Level Currency, 1 Common Wish Orb, 100 XP
- Hard: TBA
- Extereme: TBA
- Impoppable: TBA
- Normal: TBA
- The back door's wall are not Line of Sight blockers.