Solved
0
Best
—
Time
60
A quick visual brain game. Half of a pixel picture is drawn; tap the cells on the other side to complete its mirror image across a line, or its half turn around a centre dot. Solve as many pictures as you can in 60 seconds while the grids grow and the lines change.
Half of each picture is already drawn on the striped side of the grid. Tap the cells on the plain side so the whole picture becomes symmetric — a mirror image across the yellow line, or, when there is a yellow dot in the middle instead, the same picture after a half turn around that dot. As soon as every needed cell is filled, the next picture appears.
The line tells you which way to fold. A vertical line means a cell two columns to the left of it belongs two columns to the right, in the same row. A horizontal line works the same way up and down. A diagonal line runs from the top-left corner to the bottom-right corner and swaps rows with columns: the cell in row 2, column 5 belongs in row 5, column 2. For a half turn, each cell goes to the opposite side of the centre dot, as far from it as before — the top-left corner matches the bottom-right corner. Cells on the diagonal line itself are not part of either side.
Tapping a cell that should stay empty does not fill it; it flashes red and costs you 2 seconds. Filled cells cannot be taken back, so you never have to undo anything — just avoid the wrong ones. Your score is the number of pictures you complete in 60 seconds, and the clock keeps running on real time even if you switch away.
The pictures get harder as you go. The first two use a vertical line on a 4×4 grid; then horizontal lines join in, then diagonals from the fifth picture, and half turns from the eighth. The grid grows to 6×6 from the fifth picture and to 8×8 from the eleventh, and pictures fill up more of their half as you go. Save a good score to the Hall of Fame from the result card.
Work row by row, not cell by cell. For a vertical line, read one row of the drawn half from the line outwards and copy it on the other side from the line outwards; the order is simply reversed. Doing whole rows keeps your place and stops you from skipping a cell, which is the usual reason a picture refuses to finish.
Count from the line, not from the edge. The distance from the fold is what matters: a cell touching the line on one side touches it on the other too. Counting columns from the outer edge works only on small grids and becomes a trap on the 8×8 ones.
For the diagonal, turn rows into columns. The first row of the drawn half becomes the first column of the answer, the second row the second column, and so on. If that feels awkward, tilt your head so the diagonal looks vertical — it really is just another mirror. For the half turn, pick a corner and think of the whole picture spun upside down: the top row reappears as the bottom row, read right to left.
Accuracy beats speed. A wrong cell costs 2 seconds, roughly the time it takes to finish a small picture, and on the bigger grids a single slip can cost you a whole picture. Look once, then tap steadily. Symmetry is something our eyes spot instantly, but producing it is harder: mentally flipping a shape is a classic spatial-reasoning skill, and like mental rotation it gets faster with practice.