Smile Protocol

Smile Protocol cover art -65%
Genres
Action, Casual, Indie, Simulation
Released
8 Sep, 2026
Developer
OxygenStudio
Publisher
OxygenStudio

Where will you play?

2 stores compared

  1. KinguinBest priceSteam key · Global -65% $2.10 $5.99 Get Deal
  2. Steam $5.99 Get Deal

Smile Protocol price history

£1.57 today90-day low £1.57 (26 Oct 2026)Lowest recorded £1.5790-day average £1.57

£1.51£1.57£1.63 26 Oct 2026Today £1.51£1.57£1.63 26 Oct 2026Today

Today's price is the lowest we've seen in the last 90 days. Cheapest UK-working PC key across the stores we compare, any edition; tracked since 26 Oct 2026.

About this game

🎭 Smile Protocol

Smile Protocol is a high-pressure survival FPS where every run rewards your progress.

Fight through dangerous encounters, earn coins and keys, buy equipment, open cases, expand your collection, and build your own way to survive.

The longer you survive, the greater the rewards.

📦 Case System

Earn keys and open cases filled with valuable rewards.

Unlock weapon skins, attachments, gloves, grenade skins, and collectible items to expand your inventory.

Every case is a chance to discover something new.

🎒 Inventory & Collection

Build your own collection and customize your equipment.

Unlock and equip:

• Weapon Skins

• Weapon Attachments

• Gloves

• Grenade Skins

• Cosmetic Items

Create a loadout that feels unique to you.

Every unlocked item is permanently added to your collection.

📖 Story Mode

Push deeper into the facility by unlocking new sectors and surviving the threats waiting behind every door.

Explore dangerous areas, manage your resources, and fight your way forward.

⚔️ Wave Mode

Survive a fixed number of increasingly difficult waves.

Each completed wave rewards you with keys and resources.

The further you go, the greater the reward.

🔥 Endless Hostage Mode

Activate the hostage event and defend your position.

Enemies grow stronger and more numerous over time.

The longer you survive, the bigger the reward.

Stay longer for greater rewards or extract at any time and secure your earnings before the pressure becomes overwhelming.

There is no final wave.

Only survival.

💰 Trader System

Every match rewards you with coins.

Visit the Trader and convert your coins into keys to open even more cases and grow your collection faster.

Play. Earn. Trade. Unlock.

🛒 Shop System

Spend your earned coins to prepare for the next run.

Purchase:

• Weapons

• Ammunition

• Armor

• Health Supplies

• Grenades

• Equipment

Choose your loadout carefully before entering the facility.

The right equipment can mean the difference between survival and death.

👽 Choose Your Enemy Type

Customize who you fight before every run.

Face different enemy types including:

• Humanoids

• Aliens

• Skeletons

Each run can feel different depending on the enemies you choose.

🎁 Timed Rewards

Claim free rewards simply by playing.

Collect additional coins and keys over time to help expand your collection and open more cases.

Keep playing and come back regularly to maximize your rewards.

⚙️ Custom Rules & Reward Multiplier

Create your own challenge.

Trailer

Screenshots

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Screenshot
Use the ← → keys

PC system requirements

Minimum

OS
Windows 10
Processor
Intel Core i7
Memory
8 GB RAM
Graphics
GTX 1660
DirectX
Version 11
Storage
8 GB available space

Recommended

OS
Windows 11
Processor
AMD Ryzen 9
Graphics
RTX 3060
DirectX
Version 12
Storage
15 GB available space

Smile Protocol prices: questions & answers

What is the cheapest Smile Protocol price for PC?

The cheapest Smile Protocol PC key right now is £1.57 at Kinguin, 65% below the usual price. We compare 2 offers from 2 stores for PC, and prices update at least twice a day.

Cheapest price today: £1.57 at Kinguin (65% off, usually £5.29). We compare 2 stores for Smile Protocol, and prices update at least twice a day. Prices can change; the store's checkout price is final. Platform and region details come from each store's listing; the store's product page is final. Zemly may earn a commission if you buy through links on this site, at no extra cost to you (affiliate disclosure).