Number Place
Fill the 9x9 grid so every row, column and box holds 1-9. Fresh puzzles generated on the phone, always with exactly one solution.
Puzzle Emulator verified v1.0.0 18.5 KB
The JAR and JAD are the Original Java ME Version for phones and emulators. How to install.
About
A number-placement logic puzzle with an on-device generator: a valid grid is shuffled, then clues are removed one at a time while a bitmask backtracking solver proves the solution stays unique. Two input styles cover every handset: Keypad mode (2/4/6/8 move, 5 opens a number picker) for phones without a joystick, and Direct mode (# toggles) where digits write straight into the cell. Clashes are highlighted and matching digits glow.
Objective: Complete the grid correctly in the shortest time.
Modes: Easy, Medium, Hard
logic sudoku-style numbers time trial
Screenshots captured from the real JAR at 176x208 on the project's reference runtime; the third image is rendered by MicroEmulator 2.0.4.
Controls
| Key | Action |
|---|---|
| 2/4/6/8 | Move cursor (keypad mode) |
| 5 | Open number picker |
| 1-9 | Write digit (direct mode / picker) |
| 0 | Clear cell |
| # | Toggle keypad / direct mode |
| * | Pause menu |
In every game: 5 selects in menus, * pauses, and on the title screen # opens help and 0 toggles sound. The joystick and 2/4/6/8 are interchangeable.
Verification
| Level | Status | Details |
|---|---|---|
| Build verified | Yes | Compiled against CLDC 1.0 / MIDP 2.0; JAR + JAD generated |
| Reference runtime | Yes | Passed at 128x128, 128x160, 176x208, 176x220, 240x320 |
| Emulator verified | Yes | Automated smoke test on MicroEmulator 2.0.4 (176x220) |
| Real device verified | No | Not yet tested on real hardware |
Tried it on a real phone? Send a device report.
Technical details
| MIDlet | numberplace.NumberPlaceMIDlet |
|---|---|
| Platform | Java ME, CLDC 1.0, MIDP 2.0 |
| JAR size | 18.5 KB |
| Screens | 128x128, 128x160, 176x208, 176x220, 240x320 |
| Storage | RMS record store gk (settings, best score) |