How good are your eyes, really? Kolr will find out.

**Kolr** is a color mixing game where every round shows you a target color and asks one simple question: can you recreate it? You have three sliders — red, green, blue — and nothing else. No hex codes, no labels, no cheating. Just you, your color sense, and the steady creep of doubt as you inch that blue slider a tiny bit further to the left.

Play it right now at [kolr.b65.ch](https://kolr.b65.ch) — no install needed, though you can add it to your home screen as a PWA for the full app experience.

![Kolr home screen](/storage/kolr-home-named.png)

## How it works

Each round gives you a **target color** on the left and a **mix preview** on the right. Adjust your red, green, and blue channels until the two look as identical as you can make them — then hit submit. Your accuracy is calculated instantly, and you get a grade:

- **Gold** — 90% or better. You've got an eye for color.
- **Silver** — 75–89%. Solid. Almost there.
- **Bronze** — 55–74%. Respectable, but you left some points on the table.
- **Miss** — below 55%. Better luck next round.

Hit 70%+ rounds in a row and you build a **streak** that multiplies your score. Play clean, stay focused, keep the streak alive.

![Kolr gameplay — mixing colors](/storage/kolr-game.png)

## The input types keep it fresh

As you progress through the 20 levels, the way you control your mix changes completely.

In the early levels you use **Orbital** — drag rotating rings to blend the channels. It's tactile, a little hypnotic, and a great way to ease into the game. As you move into the mid-levels, **Paint Pour** takes over: press and hold to pour each color, release when you think you have enough. And in the later Expert levels, **Bubbles** pushes your precision further — tap to fill bubble clusters for each channel.

Each input type forces you to think about color differently. That's the point.

## Pick your mode

Kolr comes with four ways to play, each with a completely different feel.

### Classic

The no-pressure mode. Take as long as you need, round by round, matching colors at your own pace. Great for building your color intuition and grinding for a high score without a clock breathing down your neck.

### Time Attack

One timer for the whole session — and it keeps counting down even while you're looking at your round result. The time you save on confident rounds gives you a buffer for the tricky ones. And when time runs out, it's over. Every second counts.

![Kolr — Time Attack in action](/storage/kolr-timeattack-game.png)

### Survival

Three lives. That's all you get. Miss a color badly enough — drop below 50% accuracy — and you lose one. Lose all three and the run ends right there. No timer, but no safety net either. Every round matters.

![Kolr — Survival mode](/storage/kolr-survival-game.png)

### Daily Challenge

Once a day, everyone gets the same colors to mix. The input type and number of rounds rotate daily so it's never quite what you expect. Play it, see your score, and come back tomorrow. Your best result for the day is saved so you can always check how you did.

![Kolr — Daily Challenge](/storage/kolr-daily.png)

## Need a hand?

Stuck on a particularly evil shade of teal? Some levels come with a **help token** — tap it and Kolr briefly reveals the exact red, green, and blue proportions of the target color for five seconds before hiding them again. Use it wisely though: it costs you points (or precious seconds in Time Attack). No free lunch.

## 20 levels, three tiers

The 20 levels are split into three groups:

- **Beginner** (1–5) — clean, vivid hues. You'll feel like a color genius.
- **Intermediate** (6–12) — color grids get finer, mixes get murkier.
- **Expert** (13–20) — full RGB range, no mercy, maximum satisfaction when you nail it.

Each level unlocks the next once you clear it with at least 50% average accuracy. Your best result per level is saved, so there's always something to beat.

## Go play

Open [kolr.b65.ch](https://kolr.b65.ch) on your phone, enter your name, and pick a mode. Start with Classic to get a feel for it, then work your way through the levels. When you're ready for a real challenge, try Survival.

The source is on GitHub at [simonjenny/kolr](https://github.com/simonjenny/kolr) if you want to take a look under the hood.