Where To Find MINILAUNCHER in Sludge Life 2
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Room 604

After entering, turn right and head to the whiteboard. There you will see a 4 digit passcode for the Safebox
Chemico

Then right after entering, turn left and head through the door into the backroom
On the right side you will see the safebox, enter the passcode and voila.
Happy sludging
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Thanks to KiWY for his excellent guide, all credits belong to his effort. if this guide helps you, please support and rate it via Steam Community. enjoy the game.