Contrary to what the whitepaper states (https://docs.crabada.com/game-guide/battle-game/battle-game-rules/crabada-level-system) where each level that is a multiple of 5 will cost 500 crystal shells + 200 TUS, it seems leveling to 40 will require 250 TUS.
I'm always up for increasing TUS sinks, but at the moment there is a conflict with what is written in the whitepaper.