: Reaching major milestones, such as 1,000 pets , is a significant achievement that upgrades the player to higher tiers (e.g., Tier 7), unlocking substantial rewards like the ability to equip additional pets (up to 22 or more).
The Pet Index is a foundational mechanic in Pet Simulator X (and its successor, Pet Simulator 99), designed to reward players for collecting various pets, including normal, golden, rainbow, and shiny variants.
: Start from the very first egg in Spawn World and auto-hatch 5–10 times before moving to the next. This ensures all common variants (Normal, Golden, Rainbow) are logged early.