The Edge Match Game has exactly one valid configuration out of 6,144 audited tile-order and rotation combinations, and assembling it awards exactly 1,000 points from a fixed tray of four signed cards labeled Archive A, B, C, and D. Each card carries four edge codes in north, east, south, and west order, plus four internal motifs drawn from the arc, wave, leaf, and star families with plus or minus signs. Outer sides of the completed 2-by-2 board must show the matching compass boundary letter, while every internal side touching another card must share a motif with the opposite sign. An independent release oracle exhaustively evaluates all 4! × 4^4 = 6,144 candidates and confirms that only the literal answer A1, B2, C3, D0 passes every constraint. Partial legal placements keep the score at zero, and the board freezes only after all four cards meet their boundary and motif obligations. The puzzle runs entirely in the browser, exposes complete keyboard control, and never depends on a hidden solver, network call, or random element.
Players searching for an edge match game usually want three things: a clear rule set, a verifiable answer, and controls they can run with the keyboard. The Edge Match Puzzle tool delivers all three in a compact 2-by-2 format. Each card is a printmaker's proof with its own edge codes, and every placement is auditable against compass boundaries and signed motifs. Because the interface always shows the selected card face, current quarter turn, board cells, remaining tray cards, distinct illegal count, feedback line, and score, every move is visible on screen and recoverable with Restart.
What the Edge Match Game Is
The Edge Match Game is a single-fixture deterministic puzzle. There is no shuffle, no timer, no upload, and no random opponent. The four cards Archive A, B, C, and D are fixed, the four compass boundary letters are fixed, and the row-major placement order is fixed. Cells 1 through 4 correspond to upper left, upper right, lower left, and lower right. That order does not change during play, so every partial board can be reasoned about without surprises.
Each card owns four edge codes arranged in north, east, south, and west order. The outer sides of the completed board must show the matching compass boundary, while the internal sides — those touching another card — must share the same arc, wave, leaf, or star motif with opposite plus and minus signs. Because every label, code, motif, and rotation is fixed, the puzzle is reproducible on every device and every browser session, and the final 1,000-point finish is the same literal configuration every time.
Why This Edge Match Game Has Only One Solution
A release oracle independent of the production solver owns its own tile table, rotation implementation, boundary checks, connector matcher, permutations, and rotation loops. It evaluates every 4! × 4^4 combination. The arithmetic is 4! = 24 tile orders multiplied by 4^4 = 256 rotation combinations, which equals 6,144 complete boards. Of those 6,144 candidates, exactly one satisfies all constraints, and the literal answer is A at quarter-turn 1, B at quarter-turn 2, C at quarter-turn 3, and D at quarter-turn 0. In degrees clockwise from the tray orientation, those positions are 90, 180, 270, and 0.
The oracle does not call a live solver to generate the expected result. Instead, it generates every candidate locally and selects the single one that passes. Release tests replay the literal solution A1, B2, C3, D0 for an exact 1,000-point finish, try D0 twice at cell 1 to prove that an identical illegal repeat is deduplicated, and then try D1 to reach the second-distinct-error deadlock. They also cover unknown IDs, occupied and out-of-order cells, selection and rotation boundaries, restart, and terminal freezing. This exhaustive proof is what guarantees the Edge Match Game has a single deterministic answer rather than a family of equivalent configurations.
How to Play the Edge Match Game Step by Step
- Select an unplaced card from the tray and rotate it until the next cell's outer edges show the correct compass letters and its internal motifs complement any already placed neighbor.
- Place cells 1 through 4 in row-major order — upper left, upper right, lower left, lower right — confirming that every internal side shares an arc, wave, leaf, or star motif with the opposite sign.
- Use A at quarter-turn 1, B at quarter-turn 2, C at quarter-turn 3, and D at quarter-turn 0 to assemble the uniquely valid board and earn exactly 1,000 points.
- If a placement is rejected, read the feedback line. The first distinct tile-rotation-cell mismatch is recoverable; repeating that exact attempt is a no-op, and a second distinct mismatch closes the proof board.
- Use Restart from the shared game shell to return all four cards to the tray, clear the selection, rotations, score, and error counters, and restore cell 1 as the next target.
Edge Codes, Compass Boundaries, and Signed Motifs
Every card lists four edge codes in north, east, south, and west order. The board's outer frame demands the exact compass boundary letter on each outside-facing side, so the north side of cell 1, the east side of cell 2, the south side of cell 4, and the west side of cell 3 must each show a single matching compass letter from the fixture. Internal sides — the south of cell 1 against the north of cell 3, the south of cell 2 against the north of cell 4, the east of cell 1 against the west of cell 2, and the east of cell 3 against the west of cell 4 — must share a motif family and carry opposite signs. Arc plus meeting arc minus is a valid internal pair; arc plus meeting arc plus is rejected by the matcher.
| Edge location | Required content |
|---|---|
| Outer side of any cell | Exact compass boundary letter (N, E, S, or W) |
| Internal side touching a neighbor | Same motif family (arc, wave, leaf, or star) with opposite plus or minus signs |
| Card face during placement | One of four quarter-turn positions: 0, 90, 180, or 270 degrees clockwise |
A clockwise quarter turn moves the previous west edge to north, north to east, east to south, and south to west. Counterclockwise rotation reverses that mapping. Because the placement order is row-major, every partial board is auditable and the product never rearranges cards behind the scenes, which keeps the audit reproducible from any checkpoint.
Keyboard and Mouse Controls for the Edge Match Game
Keyboard players focus the tray and use Arrow keys to browse the four cards. Enter selects the highlighted card, Q or E rotates it, and P places it in the next legal cell. Mouse and touch players select cards from the tray with a click or tap and use the on-screen rotation buttons or keyboard equivalents to set the quarter turn. The interface always shows the selected card face, current quarter turn, the four board cells, the remaining tray cards, the distinct illegal count, the feedback line, and the score. Restart is exposed by the shared game shell alongside the best-score display, keyboard guidance, and the Boss Key.
| Action | Keyboard shortcut | Mouse or touch equivalent |
|---|---|---|
| Browse cards in the tray | Arrow keys | Click or tap a card |
| Select a highlighted card | Enter | Click or tap the card face |
| Rotate the selected card | Q | Click the on-screen rotation button |
| Rotate the selected card | E | Click the on-screen rotation button |
| Place the selected card in the next cell | P | Click or tap the active board cell |
| Restart the run | Restart control on the shared shell | Click the Restart button |
Unknown card IDs, already placed cards, invalid cells, occupied cells, out-of-order cells, and actions issued without an active selection are atomic no-ops. They do not advance the illegal counter, so a stray click never costs the run.
Scoring, Illegal Placements, and the Restart Rule
Partial legal placements keep the score at zero. The board awards exactly 1,000 points the moment all four boundary and internal constraints are met; there are no intermediate bonuses for completing only one or two cells correctly. Completion and a two-distinct-error deadlock both freeze selection, cursor movement, rotation, and placement until Restart runs.
A placement is rejected whenever an exposed outer side carries a connector instead of the required compass letter, or whenever an internal side fails to match an already placed neighbor by motif family and sign. The first distinct tile-rotation-cell signature is recoverable; repeating that exact attempt is silently ignored as a no-op; and the second distinct attempt closes the proof board. Restart returns all four cards to the tray, clears the selection, rotations, score, and error counters, and restores cell 1 as the next target. Best-score display, keyboard guidance, and the Boss Key remain available through the shared game shell so the run can be paused or reset without leaving the page.
All state and drawing remain local in the browser. There is no account, no external dataset, no tracking-based opponent, no network call, and no new dependency. The Edge Match Puzzle runs as a self-contained fixture, which is why it works as a quiet, deterministic edge match game you can play with the keyboard alone. If you want a related keyboard-friendly logic game with a similar deterministic finish, the classic 15 Puzzle offers a different single-fixture challenge in the same browser-only format.