how to restart the game from the begning ?

[L.O.R.D]

i've made a wrong upgrades and want to start again
what should i do ?

[Loga]

delete this folder "Tap_Dungeon" in :

C:\Users\{USER ID}\AppData\Roaming

{USER ID} = your user name for windows

[ScrubLord9000]

I have done this dozens of times and my save adamantly refuses to be deleted.

[TBBle]

If you're on the "beta" or "new engine" branch, it's in Steam\steamapps\common\Sakura Clicker\Sakura Clicker_Data\Saves.