What you need first
The Bouncy License is a quest, not a gem-tree node. You need Autumn Island for the Invisible Toilet and the course, and Mushroom Island for Glow Mushrooms. Both islands are normal portal or parkour unlocks.
Slime, then the key
- On Mushroom Island, find the roaming Glow Mushroom.
- Tap it until it breaks. Each defeat drops 4 Slime.
- Repeat until you have 20 Slime. That is five defeats if you start at zero and the drop stays at 4.
- Return to Autumn Island and walk to the Gem Upgrades station.
- The Invisible Toilet stands behind that station. Interact with E on PC, or the on-screen prompt on mobile.
- Confirm the trade of 20 Slime for a Bouncy Key.
The trade sends you into the course. You are mounted on a bouncy vehicle for the run. Cross the platforms and gaps and touch the finish gate. The license is permanent.
What the license does
After the finish line, the bouncy tool works on the normal islands, not only inside the course. Use it to move while you keep tapping and hatching. It does not replace Double Jump purchases, and it is not described as a Coin or luck boost.
The Bouncy Key calculator on the tools page subtracts Slime you already hold from 20. Divide the remainder by 4 if you still need a defeat count.