The 4×4 board is where everyone should start. Sixteen tiles, a handful of taps and lots of empty tiles that act as walls, so most taps are forced once you spot them.
Board
4×4, 16 tiles
Practice level
Easy
Par
5 taps on almost every board
Highest tile
5
Par figures come from solving 120 practice boards of this size with the game's solver.
Worked examples
Try each board on paper first. The solution shows how many times to tap each tile.
Example 1
222242121111
Total 21 · par 5
Show the solution
×1×1×1×1×1
Tap each marked tile that many times, in any order
Example 2
11121123432
Total 21 · par 5
Show the solution
×1×2×1×1
Tap each marked tile that many times, in any order
Tips for 4×4
On 4×4, the row-by-row method is quick enough to do fully in your head: the top row has four tiles and usually only one or two sensible choices.
Look for 1s next to empty tiles. On a small board they almost always pin down a tap.
If you're teaching someone, solve one together with the outline of each tap shown, as in the how-to-play guide.