— codes active right now.
Active Pet Sim 99 codes for Diamonds and Lucky boosts. Stack a Lucky code before opening exclusives to noticeably bump Huge pull rates.
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Expired codes
Kept for reference. These no longer work.
What Pet Sim 99 codes give you
PS99 codes reward two things almost exclusively: Diamonds (the premium currency, used to buy advanced eggs and upgrades) and Lucky boosts (temporary multipliers on Huge pull rates and Diamond gains). The Diamond rewards are small relative to a mid-game balance, but Lucky boosts during a hatching session are genuinely valuable — stack them before opening an exclusive egg run.
The developer (BIG Games) tends to release codes in waves: a fresh batch every major update, plus one-offs tied to YouTuber milestones or charity events. Following the official social-media accounts catches all of them.
Combining codes with luck stacking
PS99 luck stacks multiplicatively. A 1.5× code on top of a 2× gamepass and a 1.25× event buff is a 3.75× total luck multiplier. Apply all of them before opening exclusives and you'll see meaningful pull-rate improvements — see the hatch odds calculator to model the boosted rates.