One tiny X at a time, a picture appears. Cross Stitch Knitting is the digital version of the craft your grandmother mastered: pick a pattern, thread your color, and fill the grid stitch by stitch.
It's methodical in the best way - the pattern tells you where the colors go, your hands (well, fingers) do the rest, and the slowly-completing picture is the reward. Bright thread colors keep it cheerful.
Zero pressure, zero timer: this is the crafting-corner of the site, next to the ASMR games. Very satisfying on a touchscreen. Free, no download.