Tangram is a puzzle you play with two gestures, drag and turn: two big triangles, a medium triangle, two small triangles, a diamond and one slanted tile, together covering exactly the 64 quarter cells of the silhouette. A run is three figures drawn from a library of 18, split across three tiers, and the difficulty follows how much the silhouette tells you rather than how ornate it looks. Tier one draws all seven dissection lines inside the silhouette, which turns the puzzle into shape matching; tier two draws only the two big triangles; tier three gives you a bare silhouette and a single hint per figure. Releasing a tile rounds its origin to the nearest cell — there is no tolerance, no radius and no angle threshold — so 「I had it right and the game would not take it」 cannot happen by construction. Two tiles on the same quarter cell, or a tile resting outside the silhouette, get a 45-degree warning hatch and a sentence on the status line, but no penalty and nothing is blocked. Rotation steps 90 degrees at a time; the diamond looks the same whichever way you turn it, so its rotate key stays dark, and the slanted tile is the only one you ever turn over. When you are stuck there are three ways out, all permanently on the control row: undo one step, recall all seven tiles, or take a hint that lights the area first and then draws the exact spot. On a desktop press 1 to 7 to pick a tile, arrows to nudge, R to rotate and F to turn over; on a phone one finger does everything.

A plastic tangram set from the stationery counter, seven tiles in a little box with a printed grid on the lid, sliding out the moment you opened it. Craft class meant tracing the figure from the textbook, and the eraser marks always ended up darker than the drawing. The tile everyone fought with was the slanted one — every rotation was close and none of them fit, until somebody turned it over. So this version makes that the rule: it is the only tile you ever turn over, and the key for it sits on the control row where you do not have to guess.

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【纸】 Pen, paper and the desk drawer · 全程 →

1. 01

   Tap the stage once to wake the run. That tap only starts the game: it does not select or place a tile.

2. 02

   Press on a tile in the tray and drag it into the silhouette. The tile lifts slightly, a dashed outline shows the landing spot, and the edges that meet the silhouette light up.

3. 03

   Let go to place it: the tile's origin rounds to the nearest cell, and going off the edge only pushes it back in. Land inside the silhouette without overlapping another tile and the tile counts as placed.

4. 04

   Wrong orientation? Press rotate for a 90-degree step. Only the slanted tile needs the turn-over key, and the diamond's rotate key is dark because turning it changes nothing.

5. 05

   Stuck? Use the three exits on the control row: undo one step, recall all seven tiles, or take a hint that lights a two-by-two area first and then draws the exact spot.

6. 06

   Cover the silhouette with all seven tiles to finish; after the cutscene the next figure loads. Three figures in, the settlement shows this run's score, your best, the time, hints used, the seed and a copy link.

Start with the two biggest tiles. Each big triangle is a quarter of the whole figure, so once they are down the remaining gaps are small enough to read off directly — which is the order tier one's dissection lines are drawn in. Match edges, not colours. The medium triangle's two short edges are square to the grid while both triangle families have their short edges on the diagonal, so any long 45-degree edge in the silhouette is a big-triangle edge first. Turn before you drag. Arrows nudge one cell at a time while rotate jumps a whole 90 degrees, so fixing the orientation in the tray costs fewer inputs than fixing it after the drop. If the slanted tile will not fit, try turning it over before anything else: its mirror image is outside its rotation set, so four rotations will never produce that shape. Four of the tier-three figures have reference solutions that use it. Overlap is not failure. The hatch only tells you two tiles are fighting over the same quarter cell and the score does not move, so park the tile in the way outside the silhouette and build the inside first. To max a figure, spend no hints: 220 is the ceiling and 50 of it comes from leaving both hints unused. Spending them costs points, never completion. Really stuck? Recall first. Sending all seven back is faster than moving them one at a time, it does not touch points you have already banked, and starting the layout over costs only time.

How do you play tangram?

The goal is to cover the black silhouette completely with seven tiles: two big triangles, a medium triangle, two small triangles, a diamond and one slanted tile, which together equal exactly the 64 quarter cells of the silhouette. Press on a tile and drag it in; on release its origin rounds to the nearest cell. A tile that lands inside the silhouette without overlapping another counts as placed, and all seven placed means the figure is done — even with the two big triangles swapped, since they are identical shapes.

Why will my tangram piece not snap into place?

It always snaps. There is no tolerance, no radius and no angle threshold in the drop ruling: releasing a tile only rounds its origin to the nearest cell, so 「it was right and the game would not take it」 cannot happen. A figure that will not complete has one of three causes — a tile still sitting in the tray, two tiles sharing a quarter cell, or a tile resting outside the silhouette. The last two both wear the 45-degree warning hatch, so move whatever the hatch points at.

Which tangram piece has to be flipped over?

Only the slanted one. It is the single tile whose mirror image lies outside its rotation set: rotation steps 90 degrees at a time, and a full turn never produces the mirrored shape, so the turn-over key is the only way there. The other six have that key dark. The diamond is the opposite case — it maps onto itself every 90 degrees, so its rotate key is disabled rather than being a key that does nothing.

How many tangram figures are in this game?

18 in the library and three per run. The three tiers follow how much the silhouette tells you: tier one draws all seven dissection lines inside it, tier two draws only the two big triangles, tier three gives a bare silhouette. The figures also get larger tier by tier, the number whose reference solution turns a tile over rises from zero to four, and hints drop from two per figure to one. Nothing escalates past tier three — there is no fourth tier.

How is tangram scored here?

10 points for each placed tile, 100 more for completing a figure, and 25 for every hint left unspent on it — so a tier-one figure caps at 220 and a three-figure run at 660. Progress points are fully reversible: move a placed tile away and its 10 come straight back off. Banked points never fall, so recalling on the second figure returns the total to what you had already earned rather than to zero. Completing is not settling: the figure's points join the total on the tick its cutscene ends.

What do I do when I get stuck in tangram?

Three exits live permanently on the control row: undo one step, recall all seven tiles, and a hint that lights a two-by-two area first and draws the exact spot on the second press. If nothing has been placed for thirty seconds the hint key also pulses once and the status line points at those three. The game will not drop the tier, change the figure, or place tiles for you — the only progress line is the one you built.

Does tangram save a half-finished figure?

Yes. Every tile's position and orientation, whether it has been turned over, which figure you are on, the score, the hints left and the elapsed time are all kept on your device, and reloading puts you back at the moment you left with no 「continue?」 prompt. Rotating the phone keeps your progress too: the silhouette frame is the same patch of cells in both layouts, so tiles already inside it stay put and only tiles still in the tray move to the new tray position. Records live in this browser on this device only.