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Bigmonsterz.io

By Erigato.space

Bigmonsterz.io drops you into a monster world as the smallest creature on the map — a plain grey mouse with a score of zero. Collect fruit, fill the evolution meter at the bottom of the screen and change into bigger forms while the leaderboard tracks the top players in the match. It runs free in your browser on desktop, no download needed.

Game info

Developer
Erigato.space
Rating
Not yet rated
Release date
Jul 3, 2020
Last updated
Sep 28, 2026
Technology
HTML5
Platforms
Web Browser (Desktop)

Controls

  • Mouse — move your monster toward the cursor

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How to Play Bigmonsterz.io

Your monster follows the mouse cursor, so movement is a matter of steering rather than pressing keys. The world is a grid of green and sandy zones dotted with gnarled dead trees, leafy trees and scattered fruit — oranges, grapes and other pickups that raise the score counter beside the crown icon in the top-left.

Under the score sits a running match timer, and along the bottom of the screen a bar shows your progress toward the next evolution as a percentage. Fill it and your monster changes appearance: the starting grey mouse becomes a larger brown one, then further forms. A preview panel in the bottom-right corner shows what you evolve into next.

The leaderboard on the right lists the top six scores in the lobby plus your own rank out of everyone currently playing, so you can see exactly how far you are from the top. Since you begin as the weakest monster in the world, early play is about feeding safely before you go anywhere near the big ones.

Tips

  1. Score jumps fast at the start — the first evolution can arrive within the opening seconds, so hoover up every fruit you can reach.
  2. Watch the percentage bar, not just the score. Knowing you are at 63% tells you how close the next form is before you take a risk.
  3. Check the bottom-right preview so you know which monster you are about to become.
  4. Use the rank line under the leaderboard as a gauge: if you are 26th of 26, stay in quiet fruit-heavy areas rather than chasing bigger players.
  5. Trees and dead trunks break up sightlines — circle them while feeding instead of running across open grid.

Features

  • Live leaderboard showing the top six players plus your own rank in the lobby
  • Evolution system with a percentage bar and a preview of your next monster form
  • Fruit pickups such as oranges and grapes that raise your score
  • Match timer that counts your survival time
  • Mixed grassland and sand map scattered with trees and dead trunks

Frequently Asked Questions

Is Bigmonsterz.io free to play?

Yes, it is completely free and runs in your web browser with no download or install.

Can I play Bigmonsterz.io on my phone?

No, it is listed for desktop only and is played in landscape with a mouse.

Who made Bigmonsterz.io?

It was developed by Erigato.space and released in 2020 as an HTML5 game.

How do I evolve into a bigger monster?

Collect fruit to raise your score and fill the evolution bar at the bottom of the screen. When it reaches 100% you change into the next form, which is previewed in the bottom-right corner.

What do the names on the right side mean?

That is the leaderboard for your current match. It lists the top six scores, and the line beneath it shows your own rank out of all players in the lobby.