The Rebirth Layer is the largest systems pass Ice Tycoon 2 has shipped. It introduces a full Research Tower, a three-perk rebirth tree, and three new trophies that players must collect before they can prestige again.
The most efficient route is to grab the Super Researcher perk on your first rebirth point, then chase the trophies in the order Square, Triangle, Circle. Each trophy costs real Robux via a shop unlock, so plan your second rebirth capital around them.
Hard Mode players should expect $63M in cumulative chip costs without Super Researcher, and $31M with it. That single perk cuts the research grind by $32M.