Colour Clash is based on the classic Stroop test used by psychologists to measure focus. A colour word appears on screen, but it is printed in a different colour — the word RED might be printed in blue. Your job is to tap the colour of the ink, ignoring what the word says. Your brain wants to read the word, so staying with the colour takes real concentration and gets harder as you speed up. It is a quick, addictive workout for attention and reaction time.
It is the delay your brain feels when a colour word is printed in a different colour. Reading is automatic, so it fights with naming the ink colour — that conflict is what makes the game tricky.
Always the colour of the ink, never the word. If the word BLUE is printed in red, the answer is red.
Yes, the daily set is drawn from the same seed for every player. Play again gives a fresh random set for unranked practice.