What is a 'par move'?

The par is the designer's intended minimum move count for the level. Placements and rotations each count as one move; removals are free. Hitting par earns ★3.

Why didn't my chain of mirrors work?

Beams bounce in 90° increments. Make sure each mirror's orientation matches the beam's incoming direction. Tap the mirror to rotate it and try the other orientation.

Can I cross two beams?

Yes. Beams crossing the same empty cell pass through each other without interacting. Only when they meet at a target do their colours combine additively (R+G makes the target yellow, etc.).

Why won't my white-light puzzle pass through a splitter?

A splitter only splits when light enters from its back (the side its orientation points toward). Rotate the splitter so its 'point' faces away from the incoming beam — that's when the white light separates.

Lumen Prism

Lumen Prism is a wave-propagation puzzle. Place mirrors, splitters, and colour filters on a grid to route neon beams from each source to every target. Each level introduces a new optical primitive — reflection, RGB splitting, additive recombination — and challenges you to find the par-move solution. 30 hand-designed levels across five chapters.

How to play

Tap a tray slot below the board to pick an element (mirror / splitter / filter), then tap a board cell to place it.
Tap a placed element to rotate it 90°. Shift-tap (or long-press) to return it to the tray — removals do NOT count against your move budget.
Mirrors bounce a beam 90°. Splitters break white light into R + G + B beams (at 1/3 intensity each). Filters pass only their colour.
Targets accept the colour shown on their outline. Combined-colour targets (yellow, cyan, magenta) need both component colours hitting them at sufficient intensity.
Solve in par moves for ★3, par + 2 for ★2, or any solution for ★1. Star ratings persist per level.

Tips

Removals are free. Place a mirror, see what happens, then take it back — experimentation costs nothing.
Splitter intensity is exactly 1/3 per output. If a target needs 1.0 intensity, you cannot use a splitter on that path.
Filters block colours; they do NOT reduce intensity for the colours that pass through. Use them to clean up RGB recombination at converging targets.

FAQ

What is a 'par move'?: The par is the designer's intended minimum move count for the level. Placements and rotations each count as one move; removals are free. Hitting par earns ★3.
Why didn't my chain of mirrors work?: Beams bounce in 90° increments. Make sure each mirror's orientation matches the beam's incoming direction. Tap the mirror to rotate it and try the other orientation.
Can I cross two beams?: Yes. Beams crossing the same empty cell pass through each other without interacting. Only when they meet at a target do their colours combine additively (R+G makes the target yellow, etc.).
Why won't my white-light puzzle pass through a splitter?: A splitter only splits when light enters from its back (the side its orientation points toward). Rotate the splitter so its 'point' faces away from the incoming beam — that's when the white light separates.

Lumen Prism

棱镜光路是一款波传播谜题。在网格上放置反射镜、分光器、彩色滤镜,把每一束霓虹光从光源引到每一个接收器。每章引入一种新的光学元件 —— 反射、RGB 分光、加色合成 —— 并挑战你在 par 步数内完成。30 关手工设计,横跨 5 个章节。

玩法

点棋盘下方托盘里的元件选择(反射镜 / 分光器 / 滤镜),再点棋盘空格放置。
点已放置的元件旋转 90°;Shift 点击(或长按)收回托盘 —— 收回不计入步数。
反射镜按 90° 反射;分光器把白光分成 R+G+B 三束(每束 1/3 强度);滤镜只让指定颜色通过。
接收器接受外圈所示的颜色;复合色目标(黄/青/品红)需要对应原色同时命中且强度达标。
在 par 步数内完成得 ★3,par+2 内 ★2,通关即 ★1。每关星级永久保存。

玩法技巧

收回元件不花步。先试一种摆法,不对再收回 —— 试错完全免费。
分光器输出强度恰为 1/3。如果某接收器要求 1.0 强度,这条路上就不能放分光器。
滤镜只挡颜色,不削弱通过颜色的强度。用它在加色合成的汇合点上'净化'掉多余分量。

常见问题

什么叫 par 步数?: Par 是设计师设定的最优步数。放置和旋转各算 1 步,收回不算。在 par 内完成得 ★3。
为什么我的反射镜链不工作?: 光只按 90° 反射,先确认每面镜子的方向与入射方向匹配。点镜子可切换两种斜面。
两束光交叉会怎样?: 两束光穿过同一格不会互相影响;只有同时打到一个接收器上时,颜色才会按加色合成(R+G 把接收器变黄)。
白光为什么进不了分光器?: 分光器只在光从'背面'入射时才分光 —— 那一侧由它的方向指出。把分光器旋转到背面对着光源方向,白光就会分成 RGB。