The hardest Celeste mod... with THEO ???????? 

Parrot told me I overrated a bit the difficulty, so this is the official difficulty of this challenge :
2.5K-orb is Green GM+3 (That's now on Parrot's Difficulty Reference Spreadsheet, and I'm proud of this)
2.5K-orb is Red GM+2 (But not valid due to impossible section)
2K3 is difficulty tier with Theo, so Red GM+2.
1.5K-1 is Red GM+2.
Both 2K3 and 1.5K-1 are both doable savestateless.
2.5K-orb is maybe possible with only 2 savestates, but I swear red bubble section is janker and harder than 2K3 !