Prism Posts
Prism Posts is a merge tower defense that plays in the browser on phones, tablets and computers, for one player.
Buy lenses in four colours of light and drag them onto posts beside a garden lane to stop gloom moths. Two equal lenses merge into a stronger one, while two colours of one level mix into a lens with both effects at half strength. Holding 25 waves opens the next of six maps, and stars buy perks.
How to play
- Buy a lens
- Drag the lens onto a post beside the lane
- Drop two equal lenses together to merge them; two colours of one level mix
The game shows these steps as you play, the first time.
Controls
- Buy a lens (B)
- Drag lenses onto posts, and onto each other to merge (same) or mix (two colours)
- Space sends the next wave
- ×2 or F speeds up
- Esc pauses
Tips
- Dropping a lens on one that does not match simply swaps them, so you can shuffle the tray and the posts freely without losing anything.
- Green is the only colour that spreads to a group and Blue the only one that slows, so those two are worth mixing into single-target Red or Gold lenses.
- A mixed lens only merges with an identical mixed lens, so mixing is best left for when the tray is full, which is exactly when the bot does it.
How much stronger is each lens level?
Each level is about 1.8 times the one below, up to level 5, and reach grows a little with each level too. A level-3 lens is roughly three times a level-1 one, which is why the bot merges equal pairs before it does anything else.
What do the moths cost me?
Each moth that reaches the lamp house takes one of your 20 lights, and the great moth, which comes on waves 10, 20 and 25, takes five. Stars go by lights lost: three for none, two for three or fewer, one for any win. Moths grow tougher by 16% a wave and 12% a map.
About this game
Made by Sucia in Houston, Texas. Built with AI assistance, designed and tested by Sucia. Last updated October 5, 2026. It plays in the browser on phones, tablets and computers, with no download and no sign-in; your best scores and progress stay in this browser on this device. Without a pass, every game is free for 5 minutes a game and 30 minutes a day; an Arcade pass removes the limit. How Sucia makes and tests its games.
Also by Sucia
Sucia Studio, a video editor for streamers, runs on Windows and Linux: record, cut long VODs by transcript and make Shorts. YouEdit, a video editing service for stream recordings, turns a recording into a YouTube video, Shorts, titles and the upload text, quoted in credits before it is made. Streaming on Twitch, Kick or YouTube? Sucia Live makes highlight videos and Shorts from your VOD.
Rate Prism Posts
Not enough ratings yet.
Play a round, then rate it here. One rating per device; nothing about you is kept.
More tower defense games
