Star Battle runs fully without a mouse because every touch and pointer action has a keyboard equivalent. The arrow keys move the selection, S or Space places a star, X marks a cell empty, Delete or Backspace clears a cell back to unknown, and Enter triggers the same Check Battle action as the on-screen button. The 5 by 5 board stays inside a narrow mobile container, the selection outline tracks the keyboard cursor, and the controls meet the shared minimum touch height, so a tablet on a desk, a touchscreen in kiosk mode, or an accessibility setup without a working pointer can still complete the puzzle end to end. Native buttons expose each cell's row, column, region, and current state to assistive technology, and the implementation runs entirely in the browser using no package dependencies, no account, no permission, and no upload.
How to Play Star Battle Without a Mouse
The keyboard mirror of the interface means no step requires a pointer device. Every keyboard action corresponds to an explicit on-screen control, so the workflow below reproduces a complete mouse-free session on the Star Battle puzzle page.
- Open the game and let the first cell load as selected. Press the arrow keys to move the highlighted outline to any cell on the 5 by 5 board.
- Press S or Space to place a star in the selected cell when your deduction says a star belongs there.
- Press X to mark the selected cell empty when no star can fit because of row, column, region, or no-touch rules.
- Press Delete or Backspace to clear the selected cell back to its original unknown state if you change your mind about a star or an X.
- Repeat the previous steps until every one of the 25 cells is decided as either a star or an empty cell.
- Press Enter to trigger the Check Battle action, the same check the on-screen button runs, and read whether the placement is the unique 1,000-point solution.
- If the board is incomplete, the game tells you that cells are still unknown and lets you keep editing without spending a mistake.
- If the board is complete but wrong, the game consumes one mistake and leaves the board editable so a single deduction can be repaired.
- If you press Check Battle a second time on a fully decided but still invalid board, the run deadlocks and only Restart clears it.
- On a correct, fully decided board, the game freezes all controls, awards exactly 1,000 points, and stops accepting input.
The double-Escape boss key also works entirely from the keyboard. Press Escape twice quickly to cover the puzzle with a spreadsheet-style screen, then press it twice again to return. Restart returns to the same original region map with all 25 cells unknown, zero mistakes, zero score, and the first cell selected, so a mouse-free session can be reset, retried, or rehearsed indefinitely without a pointer.
Keyboard Controls Reference
The mapping below reflects the exact controls shipped with the game. The values come directly from the product contract that defines how the browser runs every interaction, not from category assumptions.
| Action | Keyboard Key | Touch or Mouse Equivalent |
|---|---|---|
| Move selection | Arrow keys | Tap or click an adjacent cell |
| Place a star | S or Space | Tap the Place Star button or cycle to the star state |
| Mark cell empty | X | Tap the Mark Empty button or cycle to the empty state |
| Clear cell | Delete or Backspace | Tap the Clear button or cycle back to the unknown state |
| Check battle | Enter | Tap or click Check Battle |
| Boss key cover | Double-Escape | Not exposed on the touch surface |
| Restart puzzle | Not bound | Tap or click Restart |
Clicking or tapping a cell also cycles through the three states, so a mixed session is possible. The three explicit buttons for Place Star, Mark Empty, and Clear exist so a player who already knows the desired state can apply it without cycling, which helps when repeated presses would otherwise toggle through unwanted states.
Understanding the 5 by 5 Board Layout
The board is a fixed 5 by 5 grid divided by heavy borders into five irregular connected regions labeled A through E in the corner of every cell. The unequal region sizes create the deductions: A has two cells, B has eight, C has two, D has five, and E has eight. Region size does not change the requirement of exactly one star, so the two-cell regions are not easier in any structural sense; they simply constrain where a star can sit. Every cell belongs to one and only one region, every region is connected through shared sides rather than isolated pieces, and the region map was authored for this specific game rather than imported from a published booklet or another site.
The five regions form the central clue. With one star per row, one per column, one per region, and a no-touch rule that forbids sharing a side or a corner between any two stars, the search space is small enough for the row-by-row bounded backtracking solver to audit in one pass. The solver visits one row at a time, rejects a column or region already used, rejects a column adjacent to the previous row's star to satisfy the no-touch rule, and stops the moment a second complete placement appears. For this board the search returns exactly one legal answer, which the game accepts and the deterministic 1,000-point reward then unlocks.
How the Unique Solution Is Verified
Uniqueness is not asserted from a stored answer. The implementation includes an independent bounded backtracking solver that searches for any other placement meeting the same row, column, region, and no-touch rules. The search caps at two answers and requires a final count of one before the puzzle is approved. When the check completes, the puzzle's five-star answer is unique, the board is accepted, and the 1,000-point reward is unlocked once on a correct complete submission. A fully decided but invalid board keeps the game editable so that one mistake can be repaired, while a second such check deadlocks the run and forces a Restart rather than silently corrupting the score.
Privacy, Storage, and Local Scoring
All moves, checks, uniqueness logic, and best-score storage run in the browser. The game uploads nothing, requires no account, requests no device permission, calls no paid service, and adds no package dependency. Best score is kept locally so the keyboard-only session finished today is the same number that reappears the next time the page loads. The shared game shell supplies score display, locally stored best score, Restart, and the double-Escape boss key. Pressing Escape twice quickly covers the puzzle with a spreadsheet-style screen, and pressing it twice again reveals the board, so even the privacy flow has a keyboard path that needs no pointer.
This workflow does not depend on a touch screen, a working mouse, a persistent internet connection, or any device permission. The accessibility-friendly design means a screen reader can read each cell's row, column, region, and current state through the native button labels, and the keyboard cursor is always visible through the selection outline. A mouse-free playthrough is therefore the expected interaction path, not a fallback, and every action that exists on the touch surface has at least one keyboard equivalent.
This puzzle is recreational and uses the familiar one-star ruleset documented in the 30th World Puzzle Championship instruction booklet, with an independent cross-check against the standard rules. The 1,000-point reward only means the board matched its deterministic rules before the second invalid complete attempt; the score does not measure intelligence, attention, memory, or any other personal trait, and it should not be used to compare, rank, diagnose, or label people.