peek at solution solve puzzle
quality:
difficulty:
solvability: line & color logic only
Puzzle Description:
Lambda is related to the half life of radioactive elements in two ways: it is nuclear physic's decay constant, and it is the logo of the video game Half Life.
#1: Kurt Kowalczyk (bahabro) on Feb 16, 2019
fun one, Joe! everything fell right into place as it went :)#2: Teresa K (fasstar) on Feb 23, 2019
Great puzzle, Joe. I like the shading, even though it meant a tough solve (for me anyway).#3: Eric (kelalatir) on Nov 15, 2025 [SPOILER]
Great puzzle!#4: Jessikitty Rose (jrosemarsh129) on Mar 24, 2026 [SPOILER]
The shape started looking familiar, until it finally crystalized into the Half Life logo. I spent many an hour on that game, and on it's recent remake, Black Mesa.
This was a tough solve for me, as well. I wouldn't have been able to solve it when I first joined this site.
Lambda also represents eigenvalues in linear algebra... a math class I've forgotten most of. This brought to mind a memory of singing with a math friend before we took linear algebra (to the tune of Edelweiss), "Eigenvector, eigenvector, I don't knooow what youuuuu are."
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