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About Slug's Sister Defense

Slug's Sister Defense is an action game featuring Slug, an overprotective brother from Goonya Monster. His sister Snail has fought off Goos, Undead and other Monsters, but now her enemies are plotting revenge. Slug sets out to protect her as she faces this new threat.

Defend Snail

Snail stays in the center as enemies try to break through her shield. You protect her for as long as possible by charging at enemies and wiping them out. Slug does not take damage, and equipped weapons fire automatically.

Deploy and evolve weapons

As you level up, you can acquire and enhance weapons and gear, place weapons where you choose, and collect them again to adapt to different situations. To evolve a weapon, acquire specific gear and reach its maximum level; the weapon evolves when you level up next. Evolved weapons have improved visuals and performance.

Face powerful Monsters

Unique Monsters have special skills, and some specifically target Slug to interfere with his defense of Snail.

Upgrade your gear

Coins collected in battle can be spent to enhance gear on the Power-Up screen in the title menu. Gear effects persist unless you reset them, allowing your power to grow over time. You can also reset your upgrades to take on an extra challenge.

Frequently asked questions

Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.

Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.

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