Mario Superstar Baseball

No controller

Preparing graphics

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Button layout

Drag any button or the stick to move it. Tap one to change its size. Drag this box by its title.

Size Opacity

L

START

R

Z

Y

X

A

B

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Unlock

Enter the password to play. This browser stays unlocked afterwards.

Insert disc

The game runs from your own copy of Mario Superstar Baseball (USA, GYQE01) as a .iso, .gcm or .ciso image. It stays on this computer: the browser keeps a private copy so you only do this once.

Drop the disc image here or click to choose a file

Play online

Play a friend, each on your own device. Create a room and send them the link: it brings them straight in.

Your name

or join with a code

Practice online

Plays exactly like an online game against another browser: your inputs go through the same lockstep and input delay, and the other side's packets cross a simulated network. The computer plays the other team.

Ping Jitter Loss

vs

Stadium Innings

Online game

Room

Connecting…

Send your friend this link. It brings them straight into this room and unlocks the game.

Player 1 · runs the menus

VS

Player 2

Both games start at the title screen. Player 1 picks Exhibition; then you each pick a captain and take turns drafting your teams.

Reading disc

Keeping a copy in this browser's storage…

Play ball

Exhibition at Mario Stadium, with every character.

Controller test

No controller found.

Keyboard controls

Move	`←` `↑` `↓` `→`
A / B / X / Y	`X` `Z` `C` `V`
Start	`Enter`
L / R / Z	`Q` `E` `Shift`
C-stick / D-pad	`WASD` / `IJKL`

Add to Home Screen

The game gets its own icon and opens full screen, without the browser's toolbars.

Tap Share in the toolbar (or under ••• first).
Scroll down and tap Add to Home Screen.
Leave Open as Web App on and tap Add.

The home screen app keeps its own data: it asks for the password once more and saves the game data again the first time.

Browser not supported

Use a browser with WebGPU: a recent Chrome or Edge, or Safari 26 (iOS 26 / macOS 26) or newer.

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