Give the next move some space.
An untimed puzzle works best when a change is a choice rather than a reaction.
Use Undo without judging it
Taking a move back is one of the controls, not a penalty or an admission of failure. It helps you see what the gap made possible before and after the slide.
Finish a thought, not necessarily the board
A useful stopping point might be understanding one row. You do not need to solve the full arrangement to end the visit, and no streak depends on it.
Reset expectations with the page
A reload starts a fresh local attempt. There is no financial investment or online profile to protect. The decorative celebration does not turn the result into a prize.
Make the input comfortable
Use keyboard controls or tap a neighbouring tile, whichever feels clearer. Mention the gap position if you report a control problem. Keep the note limited to the issue rather than sensitive personal details.
A clear way back
Read the controls before returning, or leave the activity for another time.