Start in open space
Large clear areas give a new filler room to grow. Crowded corners usually produce tiny gains.
The 30-second territory duel
Every tap takes space.
Place a shape. Watch it grow. Claim more of the board than your rival before the clock hits zero.
● Free to play · No download · Works on mobile
BLUE42.8%
12
RED38.5%
Your turn — choose an open point
30seconds
per match
per match
3×3board and
filler combos
filler combos
7match-changing
powerups
powerups
0downloads
required
required
How it works
Three rules.
Endless decisions.
The idea is instant. The strategy reveals itself one gap at a time.
-
01
Choose a point
Tap anywhere open inside the board. You get a few seconds per move — if the clock runs out, the spot you are aiming at is used, otherwise a random one is picked.
-
02
Watch it grow
Your filler expands until it meets an edge, another shape, or its size cap.
-
03
Own the zone
When time runs out, the player covering the larger share of the board wins.
Expect the unexpected
Powerups turn a tidy plan into beautiful chaos.
Touch a glowing token with a filler to swing the match. Clear a rival cluster, steal nearby territory, scatter bonus shapes, or claim a sudden gold patch.
Play smarter
Four habits that win more space.
There is no perfect tap, but there are reliable ways to make each one count.
Use the boundary
The board edge is predictable. Place beside it to shape safe pockets and limit your rival’s options.
Think one gap ahead
The best move may be the one that ruins your rival’s next move, even if it is not your largest filler.
Route through powerups
A slightly smaller filler can be worth it when the token it touches changes the whole board.
Change the geometry
Same rules.
A different puzzle.
Mix three playable areas with three filler shapes. A circle inside a triangle rewards different instincts than squares on a square board.
- Playable areaSquare, circle, or triangle
- Filler shapeCircle, square, or triangle
- ↻Turn styleAlternating or simultaneous
Pick your rivalry
One board.
Three ways to play.
Jump in instantly
Solo vs AI
Easy, medium, and hard opponents make this the fastest way to sharpen your instincts.Share one screen
Local 2-player
Pass the device, take turns, and settle the score with someone in the same room.Challenge anyone
Online multiplayer
Find a random rival or create a private room and share the four-digit code with a friend.Quick answers
Before you tap in.
Is fill.zone free to play?
Yes. The game is free in your browser with no download required. Open it and start a quick match.
How long is a match?
A standard match lasts 30 seconds, plus a short 3·2·1 countdown. It is quick enough for one round and strategic enough for a rematch.
Can I play with a friend?
Yes. Play pass-and-play on one device, find an online opponent, or create a private online room and share its code.
Does it work on my device?
fill.zone works in modern browsers on phones, tablets, laptops, and desktop computers. It is designed mobile-first and plays especially well by touch.
Go deeper
From quick rules to better instincts.
Read a focused guide, then bring one new idea into your next thirty-second match.
8 minute strategy guide
9 ways to claim more space
Read true clearance, deny the next move, and change your plan with the board geometry.
Read the guide
Complete field guide
Every powerup explained
Learn all seven effects, their ideal targets, and when a token is worth the detour.
Meet the powerups
v1.0 devlog
From geometry to multiplayer
See how one deterministic shape rule grew into a complete competitive browser game.
Read the field notes