How the record dates it
Public rebirth coverage for Build a Base and Steal surfaced July 20, 2026, in this site's update watch. Five days later, on July 25, Sportskeeda published the complete requirements-and-rewards table that remains the standard reference, and Pro Game Guides added its summary counting 29 different pets across the ladder.
The system's mechanics as documented: the Rebirth icon sits on the left side of the screen after spawning; each of 16 tiers requires a Cash pile plus a specific pet pair; claiming pays a permanent Luck multiplier, +2 pet slots, +3 defense blocks, and gear.
What the ladder changed for players
Progression gained a spine. Before the table circulated, sessions optimized per-second income; after it, every Cash pile routes toward the next requirement pair - from Cat + Chicken at 50,000 (tier 1) to the final tier at 10 quadrillion.
Selling behavior changed: requirement pets must stay held until the tier claims, so duplicates of ladder species (Owl, Llama, Zebra, Elephant through Fairy and Mermaid) became keeps rather than seller fodder.
The permanent Luck line (2x at tier 1 to 208x at tier 16) turned rebirths into the roll-quality engine, linking the reset system to pet acquisition and the Golden-mutation hunt.
