oneGame — five in a row on a loop
Get five in a row on a 6×6 board — but lines don't stop at the edge, they continue on the opposite side. The board is a loop: a torus (a doughnut).
Rule: the first to place five of a kind in a row, column or diagonal wins. The edge is not a border — what leaves on the right comes back on the left; what leaves at the bottom returns at the top. You can also drag the board: what leaves on one edge comes back on the other. 2×2 and 3×3 show the same board copied side by side; the dashed frame is the board, around it you see what lies beyond the edge. Hamster wheel – the gentlest board, a good warm-up. It wraps left to right only, with no mirroring: what leaves on the right comes back on the left in the same row. Top and bottom are real edges with nothing beyond – so in the 2×2 and 3×3 views the twins appear only to the sides, with void above and below. In 3D you see it from the inside, as the hamster does: the board runs around the wheel three times over, and the wheel rolls around you. Möbius strip – a boss level. What leaves on the right comes back on the left, but upside down: row 2 meets row 5, and a diagonal that crosses the edge continues leaning the other way. Top and bottom are real edges with nothing beyond. That is why in the 2×2 and 3×3 views the side copies are mirrored and there is void above and below – and the winning line points the opposite way in a mirrored copy. Not a bug: this is what a straight line looks like on the strip. Klein bottle – the hardest level. Top and bottom wrap like the torus, left and right wrap mirrored: row 2 meets row 5, and a diagonal that crosses the edge continues leaning the other way. In the 2×2 and 3×3 views the copies above and below are twins, the ones to the sides are mirror images – and the same winning line runs the opposite way in a mirrored copy, sometimes showing only a stub cut off at the canvas edge. Not a bug: this is what a straight line looks like on the bottle. In 3D the neck passes through its own wall – the nebula hides that. Football – the sphere's game. There are no straight lines here (the pentagons bend the surface), so instead of rows you collect crowns: a crown is a pentagon and the five hexagons around it. You take turns on the 32 faces until the ball is full; a crown belongs to whoever holds more of its six faces (3–3 is nobody's). More crowns wins; on a tie the second player wins – that balances the first move. Every hexagon counts in three crowns: that is what makes it hard. The rings show who is ahead in each crown; a thick ring is already settled. Drag to rotate, tap a cell to play. 4×2 and 6×3 wrap several copies of the board around the doughnut – the twin boards, bent into a loop. Crystal: 36 flat faces, one cell per face.