Left or Right: Quick Sort

A card appears in the middle. Send it left or right by the current rule, shown on both sides of the screen. Tap the left half or the right half, as fast as you can. You have 60 seconds, and the rule changes while you play. Your score is correct answers minus wrong ones.

• 3 levels: Easy sorts by shape only. Normal swaps the sides every few cards. Hard switches between shape and color
• The rule is drawn with pictures, so you can play without reading
• A wrong answer locks you for half a second and the card stays. Speed and accuracy both count
• Results show correct, wrong, best streak and accuracy
• Grades from "Easy start" to "Lightning mind"
• Records: your top 10 for each level, plus bests for today, this week, this month and all time
• Pause any time. The cards are hidden while paused
• 3 free hearts every day. Each game uses one, and you can watch a short ad to get more hearts
• Works offline and plays in 9 languages

Tips
• Check the signs on both sides every time the "rule changed" alert appears
• On Hard, the card's color can fool you on a shape round. Look at what the rule asks for
• Find a steady rhythm. A miss costs more than a short pause