Gurumin: A Monstrous Adventure (PC)

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Alternate costumes

Complete the indicated task to unlock the corresponding alternate costume. Use the dresser in the corner of Parin's room to change costumes.

CostumeHow to unlock
ArmorGive 30 Gold Medals to Hyperbolic in Beginner mode.
Chinese DressGet the good ending in Hard mode.
KimonoSet the system date between January 1st and 7th.
Leopard SuitGet the good ending in Crazy mode.
Maid OutfitCan be bought from the vending machine at Spinach Caverns - Shadow Grotto.
Monkey SuiteGet the good ending in Beginner mode.
Nurse OutfitComplete Boss Rush mode in Happy mode.
PajamasGet the good ending in Normal mode.
Princess DressGive 30 Gold Medals to Hyperbolic in Normal mode.
Samurai OutfitGive 30 Gold Medals to Hyperbolic in Crazy mode.
Santa OutfitSet the system date between December 25th and 31st.
School UniformGet the good ending in Happy mode.
SwimsuitComplete Boss Rush in Crazy mode.
Vampire OutfitGive 30 Gold Medals to Hyperbolic in Hard mode.
Witch OutfitGive 30 Gold Medals to Hyperbolic in Happy mode.
Work UniformComplete Boss Rush mode in Hard mode.
Workout GearComplete Boss Rush mode in Beginner or Normal mode.

Completion bonuses

Beat the game and save the game. Load the cleared saved game file to resume the game with the following bonuses. The "Item Dictionary" option will appear at the main menu. Popon will appear in town. You can now skip intermission sequences. You will have your original amount of money, junk points, wallpapers, clothing and headgear levels, and drill upgrade from your first game session.

Various Steam Achievements

Complete the indicated task to unlock the achievement.

AchievementHow to unlock
A Boring ClassIf you want this picture, tart by wearing the maid outfit.
A Young HeroYou'll get a shot at this picture during your second playthrough.
Battery Powered DrillComplete one level with A ranking.
Beginner Mode CompletedComplete Beginner Mode with all levels completed.
BookshelfPoco's furniture.
BoomboxPoco's furniture.
Cedar ChestRocko's furniture.
Cooking With GasComplete one level with S ranking.
CouchPierre's furniture.
Crazy Mode CompletedComplete Crazy Mode with all levels completed.
Devices and GearPutting the Pharaoh Hat on one of the monsters is your first step towards this picture.
Downward LungeGet the Wind Parts for attacks effective around and above you.
Dragon FlameGet the Master Parts for the most powerful attack.
DresserChucky's furniture.
Drill TornadoGet the Storm Parts, necessary damaging enemies around you.
DuckyChucky's furniture.
Dungeon Master!Complete one level with S++ ranking.
Evening StrollFor this picture, find Grandpa's hidden Platinum Medal.
Everyone's StoryFor this picture, start by changing with Puchi in the house during your second playthrough.
Fancy ShelfPierre's furniture.
Forward SlashGet the Alpha Parts necessary for this attack.
Gas Mask MangaGetting a diamond from Pamela is the first step towards getting this picture.
GoldfishRocko's furniture.
Hand Cranked DrillComplete one level with B ranking.
Happy Mode CompletedComplete Happy Mode with all levels completed.
Hard Mode CompletedComplete Hard Mode with all levels completed.
Hat RackPierre's furniture.
Incredible Phantom HunterComplete Happy Mode with S or better ranking.
Legendary DrillComplete one level with S+++ ranking.
Lots of RoofsJoke Glasses are key to getting this picture.
Low TableRocko's furniture.
Nap TimeGetting an Afro for Poco is the first step towards this picture.
Normal Mode CompletedComplete Normal Mode with all levels completed.
Old ScrollRocko's furniture.
On FireComplete one level with S+ ranking.
PhonographPoco's furniture.
Pnuematic DrillComplete one level with A+ ranking.
Potted PlantPierre's furniture.
Pretty Missile KickGet the Beta Parts necessary for Parin's favorite attack.
ShoeboxPoco's furniture.
Special WinnerComplete Beginner Mode with S or better ranking.
Spinning DanceThe Cyclo and Storm Parts must be used together for this attack.
StatueRocko's furniture.
StereoPoco's furniture.
Super Phantom HunterComplete Hard Mode with S or better ranking.
Super WinnerComplete Normal Mode with S or better ranking.
TablePierre's furniture.
Teddy BearChucky's furniture.
Toy CarChucky's furniture.
Toy DrillComplete one level with C ranking.
Umbrella BoxChucky's furniture.
Unbelievable Phantom HunterComplete Crazy Mode with S or better ranking.
Yearning for HomePierre loves Sombreros. That's your first thing you need to know to get this picture.