Home / Pet Simulator 99 / Eggs / Rusty Egg
Rusty Egg
Image: Pet Simulator Wiki contributors (CC BY-SA).
| Zone / world | Prison World |
|---|---|
| Price | 450 Void |
Expected value per hatch (computed estimate): about 15 diamonds (15). Worked out as the sum over the hatch list of (published chance x current Normal RAP), from the official feed pulled November 1, 2026, 16:42 UTC. It is an average over many hatches, not a promise for one egg: most hatches return the common pets, and the average is carried by the rare ones. Try it in the egg expected value checker.
What hatches from it
| Pet | Published chance | Normal RAP |
|---|---|---|
| Prison Cat | 90% | 16 |
| Prison Monkey | 10% | 7 |
Chances are the figures the Pet Simulator Wiki publishes. Where the wiki prints no chance for a pet, this page says Not published rather than splitting a tier figure. RAP figures are the Normal variant's recorded sales average from the official feed.
Values and exists counts: the official BIG Games public API (ps99.biggamesapi.io), pulled November 1, 2026, 16:42 UTC. RAP is a recorded average of real Trading Plaza and auction sales, not a guaranteed trade price. Pet and egg facts: Pet Simulator Wiki contributors (CC BY-SA), checked November 1, 2026. eggvalues.com is a fan site and is not affiliated with BIG Games or Roblox Corporation.