MAKE SURE YOU PLAY IN FULLSCREEN MODE! •Click to flip the bottle. •If the mystery upgrade is still grayed-out while you have all the other upgrades unlocked, close and re-open the shop to be able to unlock it.
Everything was made by me, except for the sound effects and shop music. Comment what the 3rd upgrade should be because I have no ideas whatsoever. I also have made it so spamming the bottle in the air doesn't work, so you HAVE to flip it. (≖ᴗ≖)