I Built a Daily Light Puzzle Called PRISM: Free to Play and Share

I’ve got a new one to share, and this time it’s a daily puzzle. It’s called PRISM, and the idea is simple: every day there’s one fresh light puzzle, the same one for everybody, and your job is to bend, split and mix beams of colored light until every target glows the right color. I built the whole thing from scratch with the help of AI, and like my other games it’s completely free, runs right in your browser, and needs no signup to play. Just open it and go.

If you’ve ever played Wordle, the rhythm will feel familiar: one quick puzzle a day, and a little something to come back for tomorrow. But instead of letters, you’re playing with light. A source fires a beam across a grid, and you drop pieces into its path to steer it: mirrors bounce it around corners, a prism splits white light into red, green and blue, and filters let only one color through. Where two colored beams cross, they mix into a new color: red and green make yellow, all three together make white. Get every target glowing its exact color and the puzzle’s solved.

Once you’ve cracked the daily, you can share how you did with a little spoiler-free grid of colored squares: it gives nothing away, just shows how it went. Keep at it day after day and you’ll build up a streak, there are achievements to collect, and there’s a global leaderboard if you like a bit of competition. And just to keep me honest, Sundays come with a tougher “Overload” twist.

Don’t want to wait for tomorrow’s puzzle? There’s a Zen mode with an endless supply of boards you can dial up or down in difficulty, an Archive to replay past days, and a quick tutorial if you’re brand new to it. You can play every bit of that without ever making an account, but if you’d like your streak and scores to follow you from your phone to your laptop, you can make a free one. It only ever asks for an email so you can recover your password: no daily reminder emails, no spam, nothing else. There’s also a full colorblind mode built in from the start.

It runs great on a phone, and you can add it to your home screen like a real app. It’s quietly become my favorite little two-minute break. See what you think:

Like my other games, this is something I’ll keep tinkering with and improving, so if you run into anything or have an idea, I’d love to hear it: leave a comment or use the contact form. Thanks, and have fun chasing the light!

New to This Kind of Puzzle? Here’s How to Play

It only takes a few seconds to get the hang of, and the game shows you everything as you go: the light updates the instant you place a piece. But here’s the quick version:

• The goal. Every puzzle has one or more targets: little colored rings. Light each one with a beam of the matching color and you’ve solved it.
• The light. A source shoots out a beam in a straight line. It keeps traveling until something bends, splits, colors or blocks it.
• Placing pieces. You get a small tray of pieces. Tap an empty square to drop one in, tap it again to rotate it, and watch the beam react in real time. Don’t like it? Pick it back up and try somewhere else.
• Mirrors. A mirror bounces the beam ninety degrees. Chaining a few together is how you snake the light around the board to wherever it needs to go.
• Prisms and filters. A prism splits white light into all three colors at once; a filter lets a single color through and blocks the rest. Between the two, you can make just about any color you need.
• Mixing colors. When two beams overlap, their colors add together: red and green make yellow, and all three make white. Some targets can only be lit by mixing, so keep an eye out for crossings.
• Hints and stars. Stuck? You can take a hint, but solve a board cleanly with none and you’ll earn the full three stars.

That’s really all there is to it: the trickier puzzles are just the same handful of pieces arranged in cleverer ways. Jump in and see if you can light them all up.