How does Grid Memory work?
A few cells of a grid flash blue for a moment and go dark, and you tap every cell that was lit. It is the same task as the memory grid or memory matrix tests used for visual memory training.
Level 1 lights 3 cells on a 3×3 grid for about 1.5 seconds. Every level adds cells and trims the viewing time a little. A correct cell turns green; a wrong one shakes red and ends the round. After a miss the real cells light up again so you can see what you forgot. You have 3 lives, and when they are gone the result screen appears.
When does the grid grow?
In Classic, Sequence and Rotate mode the grid gains one row and one column every time you clear three rounds in a row. It starts at 3×3 and grows through 4×4 and 5×5 up to 7×7. A miss resets the streak but never shrinks the grid.
| Grid | Lit cells by level | Viewing time |
|---|---|---|
| 3×3 | 3 up to 7 cells | from about 1.5 s |
| 4×4 | 4 up to 14 cells | 1 to 2.5 s depending on the count |
| 5×5 · 6×6 | 5 cells and up | shorter as the level rises even with more cells |
| 7×7 | up to 47 cells | 0.7 s at the lowest |
Each round scores 10 points per lit cell plus a bonus for grid size and streak. Sequence mode multiplies that by 1.2 and Rotate mode by 1.5.
What modes are there?
There are five modes: Classic, Sequence, Rotate, Two Player and Daily Challenge, chosen on the title screen.
| Mode | Rule |
|---|---|
| Classic | All cells light at once. Tap them back in any order |
| Sequence | Cells light one after another. Tap them in the same order; a right cell at the wrong time still fails |
| Rotate | After the lights go out the whole grid turns 90 degrees clockwise. Tap where the cells are now. A yellow corner mark shows where the top used to be. Hard |
| Two Player | Two people take turns on one device. Each has 3 lives, and when both are out the higher score wins |
| Daily Challenge | The same 15 levels for everyone. The grid grows every 3 levels, and clearing all 15 earns an S grade |
How is the memory grade decided?
The grade on the result screen comes from the level you reached: S from level 24, A from 17, B from 11, C from 6, D below that.
The Daily Challenge is graded by levels cleared out of 15: all 15 is S, 13 or more A, 10 or more B, 6 or more C. Under the grade a bar chart shows how many cells were lit in each round, green for a clear and red for a miss, so you can see exactly which grid size broke you. Best scores per mode are saved in this browser and the share button turns the result into a card.
Does this actually train memory?
Grid Memory exercises visual working memory, the ability to hold positions you have just seen for a few seconds. Most people hold about four positions at once, so going beyond that depends on chunking cells into shapes.
Because the Daily Challenge gives everyone the same 15 levels, comparing how far you got with yesterday shows in plain numbers how your chunking improves with practice. Brain training apps use the same memory matrix task.
How do I reach higher levels?
- Chunk cells into shapes instead of memorizing them one by one. Naming a group an L, a diagonal or the four corners turns 7 cells into two or three pieces.
- Keep your eyes still when the lights go out. The afterimage holds the first two or three cells almost for free.
- Tap the cells you are sure of first. One miss ends the round, so leave doubtful cells for last and count how many remain.
- Turn the sound on in Sequence mode. Every cell plays a different note, so you can remember the order as a tune.
- In Rotate mode anchor on one cell. Work out where the most distinctive cell lands after the turn and place the rest relative to it.
Controls
- Phone and mouse: tap or click a cell. When the input phase begins the message under the grid turns yellow.
- Numpad: on the 3×3 grid the keys 1 to 9 map straight to the cells (7 8 9 on top, 1 2 3 at the bottom). From 4×4 up, 2 4 6 8 move the yellow cursor and 5 picks.
- Arrows and WASD: move the cursor, then Enter or Space picks. Esc returns to the menu.
Best scores and the sound setting stay in this browser only and are never sent to a server. The Daily Challenge changes every day on Korean time and everyone gets the same board on the same day.