About the game
Blob Arena is an .io style growth brawl in the spirit of Agar.io. You start as one small cell in an arena far bigger than your screen, surrounded by hundreds of glowing pellets and fifteen AI rivals that play by exactly the same rules you do. Roll over pellets to inch upward, and once you are at least 14% heavier than a neighbour you can swallow it whole and keep almost all of its mass in a single bite.
The catch is that the rule cuts both ways. Anything 14% heavier than you can do the same to you, and the bigger you grow the slower you move — the lead you fought for is also the thing that stops you running away. Rivals hunt, flee and aim ahead of a moving target like real players, green spiked discs pop anyone who has grown fat, and the camera pulls back as you swell until half the map is on screen. Your score is the biggest mass you ever reached.
How to play
- Desktop: the blob follows your mouse — the further the cursor is from the centre, the harder it pulls. Arrow keys or WASD work too.
- Mobile: press and drag anywhere on the arena; a virtual stick appears under your thumb.
- Roll over pellets to grow, and cover a smaller rival completely to swallow it.
- The minimap in the corner shows the whole arena — red dots are blobs that can currently eat you.
- Press Space or Enter to start a new run after a game over; Pause freezes everything.
Rules
- You can swallow another blob only if you are at least 14% heavier, and only once its centre is well inside your body. Brushing rims does nothing.
- A swallow hands you 92% of the victim’s mass. Pellets are worth 2 mass each and respawn instantly somewhere else, so the arena never runs dry.
- Speed falls as mass rises but bottoms out at about a quarter of the starting speed, so a small blob can always outrun a big one in a straight line.
- Green spiked discs are harmless while you are small. Above 260 mass they cost you roughly a quarter of everything you are carrying.
- Mass above 320 slowly rots away, so a leader who stops hunting shrinks. Your score is your peak mass, not the mass you happen to hold at the end.
- Being swallowed ends the run immediately.
Strategy & tips
Let the big ones come to you
A giant is slower than you are, always. Instead of fleeing in a straight line the moment a red dot appears, keep feeding along a curve that stays just outside its reach. You collect pellets the whole time while it burns its own mass chasing you, and after twenty seconds of that it is measurably smaller than when it started.
Corners are where runs die
Open ground is safe because you can always turn. A corner takes two of your escape directions away and a competent hunter will herd you into one on purpose. If you find yourself drifting towards an edge with something heavy behind you, cut back across its nose early — passing close but fast is far safer than being pinned against the wall.
Hide behind a spike while you are small
Spikes only hurt blobs above 260 mass, which means the ring around a spike is a free safe zone for anyone smaller. When a heavyweight is on your tail, run straight at the nearest green disc and orbit it. Your pursuer has to peel off or pay a quarter of its mass for the privilege.
Eat the runner-up, not the crumbs
Pellets are steady but slow, and above 320 mass decay quietly eats a share of every one you collect. Real jumps come from swallowing another blob, so once you are comfortably mid-table stop grazing and start reading the leaderboard. The blob one rank below you is worth several hundred pellets in one bite.
FAQ
Why can’t I eat a blob that looks the same size as me?
Because looking bigger is not enough. You need at least 14% more mass, and since radius grows with the square root of mass, a 14% mass advantage is only about 7% more radius — nearly invisible. Check the top-five board instead of trusting your eyes.
Why does my blob feel so slow all of a sudden?
Speed falls as mass rises. That is the core trade of the genre: growth buys you the ability to eat but costs you the ability to escape. Movement bottoms out at roughly a quarter of the starting speed, so you are never completely helpless, but a big blob has to think two seconds ahead instead of reacting.
Do the green spikes hurt me?
Only once you pass 260 mass. Below that you can sit on one all day, which is exactly why they make good hiding places early on. Above that threshold a spike takes about a quarter of your mass, and the AI avoids them for the same reason.
My mass went down on its own — is that a bug?
No. Anything above 320 mass slowly rots, and the bigger you are the faster it goes. It stops a runaway leader from becoming untouchable and it is why your score is recorded as the highest mass you ever reached rather than the mass you died with.
How many rivals are there, and do they cheat?
Fifteen, and no. They read the same arena you do through the same vision radius, they flee from anything that could eat them, they aim ahead of a moving target instead of at where it used to be, and each one has its own aggression and caution values — which is why some chase you halfway across the map and others bolt at the first sign of trouble.
