2 to 4 players
Head-to-head duels or free-for-all with up to four admirals per room.
Free · 2–4 players · No signup
Sea Battle
Play the classic Battleship game online — free, multiplayer
Sea Battle is the timeless naval-combat game where two or more admirals secretly place fleets on a 10×10 grid and trade salvos until only one fleet is left afloat. On Arcadeum you can play Sea Battle right in your browser — no download, no signup wall — with friends, strangers, or AI bots.
- Browser-based
- Play with AI bots
- Team mode
- 10+ themes
Why Arcadeum
Why play Sea Battle on Arcadeum
Team mode
Up to four teams with shared boards, private team chat, and an optional hidden-ships rule.
10+ themes
Classic, modern, pixel-art, cyberpunk, nebula, vintage, sunset and more.
Free & instant
No installs, no paywall. Open a room and share the link.
Four steps · ~20 minutes
How to play Sea Battle
- 1
1. Create a room
Pick a theme, invite friends or add AI bots, and choose head-to-head or team mode.
- 2
2. Place your fleet
Drag your five ships onto your 10×10 grid. Ships cannot overlap or touch.
- 3
3. Fire at the enemy
Take turns picking a cell on each opponent’s grid. Hits go red, misses go white.
- 4
4. Sink them all
The last admiral with at least one ship afloat wins the battle.
Choose your fleet
10+ themes, one game
Ten board styles, your pick. Same game, different vibe — switch any time in the lobby.
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Reference
Game Rules
Objective
Sink all enemy ships before they sink yours! The last player with ships remaining wins.
Gameplay
The game has two phases: Ship Placement and Battle. First, secretly place your ships on your 10×10 grid. Then take turns firing at opponent grids to find and sink their ships.
Ship Placement
Place all 5 ships on your grid before the battle begins. Ships cannot overlap or touch each other. Click to place, rotate with the button.
Battle Phase
On your turn, click on an opponent's grid to fire. Hits are marked red, misses are marked white. When all cells of a ship are hit, it sinks!
Your Fleet
• Carrier (5 cells) - The largest ship • Battleship (4 cells) - Heavy cruiser • Cruiser (3 cells) - Fast strike ship • Submarine (3 cells) - Stealthy vessel • Destroyer (2 cells) - Small but nimble
Sharpen your aim
Sea Battle strategy: how to win more games
Sea Battle (Battleship) is a game of probability and process of elimination. A handful of habits separate casual players from the admirals who consistently sink first.
Hunt-and-target your hits
After landing a hit, fire at adjacent cells in one of four directions until the ship sinks. The moment it goes down, return to your search pattern — confirmation of a sinking tells you which neighbouring cells are now safe to ignore.
Search in a checkerboard
The shortest ship is two cells long, so firing in a checkerboard pattern guarantees you will eventually touch every ship without scanning every cell. This roughly halves the cells you need to try before the first hit.
Avoid edges and obvious lines
Hugging the board edge feels safe, but human opponents sweep the perimeter first because edge-placed ships have fewer escape directions. Float your fleet a cell or two off the rim.
Spread, do not cluster
Put each ship in its own quadrant when you can. Clustered fleets cascade — a single lucky hit hands the opponent two or three quick sinkings in a row.
Track misses, not just hits
Misses are information. Mentally mark the dead zones and you cut the remaining search space in half by the mid-game. Most theme boards on Arcadeum already show miss markers for you.
About the game
About Sea Battle
Sea Battle, known internationally as Battleship, is one of the oldest grid-based strategy games still played today. Players first sketched the rules on lined notebooks long before any plastic board existed — two opponents, two secret 10×10 grids, and the simple thrill of calling out coordinates one at a time.
The game made the jump from paper to plastic in the mid-20th century, becoming a fixture of family game nights, and from there to screens — pocket electronic versions, computer game adaptations, and now browser-native multiplayer.
Arcadeum keeps the original 10×10 grid and the five-ship fleet intact, then adds what the paper version never had: instant matchmaking, AI opponents, team mode, ten visual themes, and shareable lobby links. Whether you are looking for a quick game vs the computer or a longer match against a human, the rules are the same ones admirals have been arguing over for a century.
FAQ
Frequently asked questions
Is Sea Battle free to play?
Yes. Sea Battle on Arcadeum is completely free to play in your browser, with no download required.
How many players can play Sea Battle?
Sea Battle supports two to four players per room. Team mode allows up to four teams of two or more players each.
Can I play Sea Battle against the computer?
Yes. You can fill any empty slot with an AI bot, so you can practice solo or round out a smaller group.
How long does a game of Sea Battle take?
A typical Sea Battle game lasts about 20 minutes, depending on player count and how quickly admirals fire.
What are the rules of Sea Battle?
Each player secretly places a fleet on a 10×10 grid, then players take turns firing at one cell on each opponent’s grid. Hits are marked red, misses white. When every cell of a ship is hit, the ship sinks. The last player with at least one ship afloat wins.
Ready to play?
Spin up a room and share the link — your fleet awaits.