Excellent collection of puzzles adapted from research about learning – Hiding Spots — IQ Boosting Braintraining Game Review

Task: locate a target pattern within “noisy” background. E.g., in 3rd screenshot, locate corners of a square and corners of an equilateral triangle. Feedback is given for each selection of a candidate spot: red=NO, yellow=YES; green=PatternFound. Solve at your own pace — no timing to hurry your thinking (and reflection about that). Groups of puzzles can be repeated.
Review by MathPoly on Hiding Spots — IQ Boosting Braintraining Game.