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Monster Slugger is your default weapon when you start playing the game and it does pretty well in the early levels. It has a built-in area damage capability while being a melee weapon. Since it's a melee weapon, using items that can evenly increase its overall DPS and sustain makes more sense. Here are a few builds across various stages and modes of the game that you should try:
Early Game Build (Level 1-15)

All of the gadgets and passives mentioned in the image above can be obtained before level 15. This is the build I like to use for Monster Slugger:
- Passives: Vampire Teeth*, Unstable Laser, Explod-o-Matic
- Gadgets: Pepper Spray*, Boombox, Vitamin Shot*
Alternatives: Since playstyles can vary significantly, with some players preferring higher DPS while others preferring more sustain, here are a few alternatives you can swap in if you like to play a higher DPS build or a higher sustain build:
- For DPS: You can swap Boombox with either Smart Fireworks or Monster Zapper.
- For Higher Sustain: You can swap Explod-o-Matic with R&B Mixtape.
Gadgets and Passives with asterisks shouldn't be swapped in our opinion.*
Mid Game Build (Level 15-25)

Mid game builds can depend on what you're tackling in what mode, but honestly, I prefer using the same build as I do in Worlds:
- Passives: Vampire Teeth, R&B Mixtape, Unstable Laser/Explode-o-Matic/Smelly Socks
- Gadgets: Pepper Spray, Vitamin Shot, Boombox
High Level Build (Level 25+)
- Passives: Vampire Teeth, R&B Mixtape, Unstable Laser/Smelly Socks
- Gadgets: Spicy Dagger, Vitamin Shot, Really Cool Sticker/Snow Globe/Pepper Spray/Life Jacket
Worlds Build

Since you want to clear the monsters and farm efficiently in Worlds mode, we suggest you go with a mix of damage and sustain:
- Gadgets: Pepper Spray, Vitamin Shot, Snow Globe/Boombox
- Passives: Vampire Teeth, R&B Mixtape/Explod-o-Matic, Smelly Socks
This build offers good area coverage for the dense monster packs commonly found in Worlds mode while providing enough sustain to handle extended farming sessions.
Rifts Build
- Passives: Vampire Teeth, R&B Mixtape, Unstable Laser/Smelly Socks
- Gadgets: Spicy Dagger, Vitamin Shot, Really Cool Sticker
Note: Under Investigation
Dojo Build
Not Recommended
Versus Build
- Passives: Vampire Teeth, R&B Mixtape, Unstable Laser/Smelly Socks
- Gadgets: Spicy Dagger, Vitamin Shot, Life Jacket/Really Cool Sticker
Please note that builds can differ based on your playstyle, level of your gadgets, weapons, passives and there are a lot of possibilities for one single weapon. If you disagree or have some suggestions or a different build, we are open to trying it.