UNO Stack! No Mercy

UNOStack! No Mercy is a fast-paced multiplayer card game where every card can change the match.

Match colors and numbers, stack powerful draw cards, reverse the turn, skip opponents and unleash wild cards as you fight to empty your hand before everyone else.

Think you’re winning? One card can change everything.

🔥 INTENSE CARD BATTLES

Stack cards and turn a simple match into complete chaos.

Use powerful cards including:

• Draw +2 cards
• Wild +4 cards
• Wild +6 cards
• Wild +10 cards
• Reverse cards
• Skip cards
• Skip Everyone cards
• Discard All cards
• Wild Reverse Draw cards

Build your strategy carefully because your opponent may have an even stronger card waiting.

🌐 ONLINE MULTIPLAYER

Challenge real players and test your card-game skills in competitive multiplayer matches.

Create rooms, join games and battle players online.

👥 PLAY WITH FRIENDS

Create a private room and invite your friends for a fast and unpredictable card battle.

Whether you're playing casually or trying to destroy your friends with a perfectly timed +10, every match can turn around in seconds.

🤖 PLAY AGAINST BOTS

Want to practice?

Battle AI opponents, learn the rules, experiment with strategies and prepare yourself for multiplayer matches.

⚡ STACKING CHANGES EVERYTHING

Draw cards don't always mean defeat.

Stack compatible draw cards and pass the punishment to the next player.

A +2 can become +4.

A +4 can become an even bigger draw.

Keep stacking and watch the penalty grow.

But be careful — eventually someone has to draw.

🎨 WILD CARDS

Control the match with powerful wild cards.

Change the active color, attack opponents and completely change the direction of a round.

🏆 LEVELS & PROGRESSION

Play matches, progress through levels and improve your strategy as the competition becomes tougher.

Learn when to attack, when to save your strongest cards and when to take a risk.

🎁 DAILY REWARDS

Return each day to collect rewards and continue progressing through StackRiot.

🎯 EASY TO LEARN, HARD TO MASTER

The basic idea is simple:

Match the color.

Match the number.

Use action cards.

Empty your hand.

But stacking rules, wild cards and powerful draw cards make every match unpredictable.

A player holding one card can suddenly receive a massive stack and fall behind.

That’s what makes StackRiot chaotic, competitive and fun.

If you enjoy multiplayer color card games, classic shedding card games, stacking card battles and party games with friends, StackRiot: No Mercy brings those mechanics together with powerful action cards and unpredictable matches.

Build your strategy.

Stack the cards.

Survive the chaos.

Become the last player your opponents want to challenge.

Recent changes:
Welcome to UNOStack: No Mercy!

• Play intense card battles with friends and online players
• Challenge AI opponents
• Create or join multiplayer rooms
• Progress through Journey mode
• Send and accept friend requests
• Earn coins, rewards, and unlock cosmetics
• Improved gameplay stability and performance

Thanks for playing StackRiot!