For the retro archivist, KEMPer (freeware) is the best Windows emulator for Java games.
| Key | Action |
|-----|--------|
| KEY_NUM2 / UP | Jump |
| KEY_NUM4 / LEFT | Move left |
| KEY_NUM6 / RIGHT | Move right |
| KEY_NUM5 / FIRE | Sprint (faster movement) |
| KEY_NUM8 / DOWN | Enter pipe / crouch |
| KEY_SOFTKEY1 | Pause | super mario bros java game 240x320
Pseudo-code:
int cameraX = player.getX() - (getWidth() / 2);
if (cameraX < 0) cameraX = 0;
if (cameraX > worldWidth - getWidth()) cameraX = worldWidth - getWidth();
// 16.16 fixed-point (no float)
int x = 64 << 16; // 64 pixels in integer part
int velocityX = (3 << 16); // 3 pixels per frame
x += velocityX;
int screenX = x >> 16;
Loading... "Thank you, Mario! But our Princess is in another castle!" Initializing MIDP 2.0... Loading Sprites... Preparing Audio... "Press Any Key to Start!" For the retro archivist, KEMPer (freeware) is the
Document ID: SMB-J2ME-240x320-v1.0
Date: April 20, 2026
Platform Target: Java ME (J2ME) / MIDP 2.0, CLDC 1.1
Screen Resolution: 240 x 320 pixels (portrait mode, or canvas rotated for landscape) Pseudo-code:
int cameraX = player
After testing over 20 different builds released between 2006 and 2011, one version stands out as the definitive Super Mario Bros Java Game for 240x320.
Titled: Super Mario Bros REVO (v.3.2)
Developer: An anonymous Russian coder known as "Dextr."
Why it wins: It includes the Super Mario Bros 2 (USA) vegetable-throwing mechanic, SMB3 power-ups (Raccoon tail, though flying is simplified), and a level editor built into the .jar. At 240x320, the text renders legibly enough to edit tile sets on the phone itself. It has 32 playable levels and a save function that works via RMS (Record Management System).