Bessie Burger uses OT Energy to expand the Zombie Skill options available during dungeon runs. Some unlocks also require ingredients or materials collected during dungeon dives. Boss cores provide Boss Receipts for special dishes. OT Parts belong to gear development at Ink on the Brain, so collecting equipment parts alone will not solve every burger upgrade requirement.
Match the resource to the purchase
| What you need | Where it belongs |
|---|---|
| OT Energy | Buying additional Level-Up Receipts at Bessie Burger |
| Ingredients or materials listed on the dish | Gathering during dungeon dives; match the exact recipe requirement |
| Boss Receipts from boss cores | Unlocking special dishes associated with those bosses |
| OT Parts from dungeon exploration | Developing equipment at Ink on the Brain |
Check the recipe before another dive
- Return to Bessie Burger in the shopping mall and inspect the dish or receipt you want.
- Read its displayed requirement. Separate missing OT Energy from missing ingredients and a dish that still needs its associated boss reward. Having enough currency does not satisfy a separate material requirement.
- If the missing unlock is a Boss Receipt, target the relevant boss and use Bite on its exposed core when the opportunity appears.
- Revisit Bessie after the run and check the purchase again.
Goyle keeps material records in the mall's Security Room. Compare the materials you have collected with the dish requirement before committing to another dive.
A defeated boss and a bitten boss core are different steps. Do not leave a core behind when your goal is its reward.
What an upgrade changes
Unlocking Zombie Skills expands the pool offered on Level-Up Receipts. It does not guarantee that a particular receipt will appear immediately in your next dive. Choose the upgrade because you want it available, then look for it among the choices as you level.
There is no verified universal farming floor or fixed drop rate for every Bessie requirement. Use the exact dish requirement and the destinations available in your current story progression to choose your next target.