HSL Training

HSL Training is a color-perception game for practicing hue, saturation, and lightness. Observe the target color, then recreate it with H, S, and L sliders and one-step adjustment buttons. Each answer is scored from 0 to 100 using perceptual color difference (CIEDE2000). FIVE TRAINING MODES • EASY: Lock lightness and focus on hue and saturation • NORMAL: Match hue, saturation, and lightness across five rounds • HARD: Ten rounds with a 30-second clock for each color • ABSOLUTE: Match colors shown against different backgrounds • MEMORY: Memorize each target for 10 seconds, then recreate it while hidden Clear every standard round with an S grade to unlock ENDLESS for EASY, NORMAL, or HARD. Keep scoring 96 or higher with no round limit; the run ends at 95 or below. Your highest streak can be submitted to a Game Center leaderboard. FEATURES • Fine-tune every HSL value one step at a time • Review scores, grades, and perceptual color difference by round • Save a best score for each mode on your device • Japanese and English interface LIFE Each session costs 1 LIFE. One LIFE recovers at the start of every hour, up to a natural limit of 5. Completing an optional rewarded ad adds 5 LIFE. A one-time Unlimited Lives purchase lets you train without spending LIFE and removes banner ads. Built for designers, illustrators, photographers, color learners, and anyone who wants to turn color matching into a game.