Observation comes first
Before anything can be recalled, it has to be noticed. A visual challenge may ask the solver to identify a color, letter, position or sequence while ignoring irrelevant details. Clear instructions matter because the task should test the intended rule rather than confusion about what to do.
Rule switching changes the task
A familiar stimulus can produce a different answer when the rule changes. One round may ask for a letter; another may ask for its color; a later round may reverse the mapping. Switching the rule forces the solver to stop relying on the previous response pattern.
Accuracy before speed
Timed challenges can be engaging, but speed is only meaningful when the response is correct. A sensible progression begins with understanding the rule, then building consistency, and only later reducing the time required.