Confirmed
Upgrade Tree exists
Tree Crystals and global boosts are official-page mechanics.
TNT Incremental Upgrades and Upgrade Tree Guide
The official page confirms an Upgrade Tree where Tree Crystals buy global boosts. This guide connects upgrades with Cash, Rebirth, Runes, and Ascend while holding exact node costs and boost values for testing.
Held ranking
Exact priorities are held
No hard best-upgrade claims are published until node costs and boost values are tested.