Diamond Battle
Play free
Share one board of gems with a friend. Match swords to hit them, hearts to heal and crystals to charge your champion's skills. First to 0 HP loses.
Free. No download, no account. Works on phones.
Diamond Battle is a free two-player match-3 duel you play in the browser. Share one 8×8 board of gems, take turns making matches, pick one of six champions and cast skills to bring your opponent to 0 HP. No download or account.
Enter a name and create a room. Give it a password if you only want a friend to join, then share the room code. Open rooms also show up in the lobby list.
Both players choose one of six champions and press Ready. Each has its own HP, Attack, element and three skills.
On your turn, swap two neighbouring gems to make a line of 3 or more. A line of 4+ gives you another turn, but a swap that makes no line costs you 5 HP and the turn. You have 20 seconds per turn, and spending energy on a skill can replace a swap.
Bring the other champion to 0 HP to win. If 100 turns pass, the higher HP percentage wins, then the most gold.
Every gem you clear works for the player who made the move, including gems that fall into place and match on their own. Cascades keep going until the board settles.
| Gem | Effect for the player who moved |
|---|---|
 Sword |
Deals 1× your champion's Attack as damage. |
 Fire Sword |
Deals 2× Attack damage and blows up the 8 gems around it. |
 Heart |
Heals you for 3 HP. |
 Mana Crystal |
Gives 6 energy for skills (up to 100). |
 Gold |
Adds 10 gold, which breaks ties at the turn limit. |
 Spellbook |
Adds 5 experience. |
 Food |
Restores 3 stamina (up to 20). Stamina drops by 1 each turn; at 0 you lose 5 HP a turn. |
Each champion has its own HP, Attack and element, plus three skills paid for with energy from Mana Crystals. Fire beats Thunder, Thunder beats Water and Water beats Fire, so pick with your opponent in mind.
The Ember Lion
Fire
Deal 15 damage.
Turn 5 random non-sword icons into Fire Swords. Your turn does not end.
Deal 40 damage.
The Flame Archer
Fire
Deal 12 damage.
Deal 8 damage and burn for 4 damage at the start of the opponent's next 3 turns.
Deal 35 damage.
The Tide Guardian
Water
Heal 15 HP.
Absorb the next 20 damage.
Deal 25 damage and heal 25 HP.
The Frost Mystic
Water
Take up to 25 energy from the opponent.
The opponent loses their next turn.
Deal 30 damage. The opponent loses their next turn.
The Storm Breaker
Thunder
Deal 14 damage.
Clear every Sword and Fire Sword on the board as if you matched them.
Deal 45 damage.
The Wind Rider
Thunder
Take another turn right after this one.
Deal 10 damage and remove 20 energy from the opponent.
Deal 25 damage. The opponent loses their next turn.
Yes. It is free to play in any modern browser, with no download, no account and no ads.
Two. Every match is a live one-on-one duel between two people, each in their own browser tab or device. There is no computer opponent.
Create a room, optionally set a password, and send your friend the room code. They enter the code (or pick the room from the lobby list), you both choose a champion and press Ready.
Yes. Swipe or tap two neighbouring gems to swap them. The layout fits phones, tablets and desktop screens.
Your seat is held for 30 seconds. Reload the page within that time and you return to the same match with the same board.
Both players share one board, so every match you make also changes what your opponent can do next. Gems are attacks, healing and resources rather than points, and champion skills add a layer of strategy.
None is strictly better. Elements form a cycle: Fire beats Thunder, Thunder beats Water, Water beats Fire. With the advantage your damage is 25% higher; against it, 20% lower. Tanky champions have more HP but less Attack.