Infi Advent of Code
Solve one festive two-part programming puzzle each December, in Dutch
Each December the Dutch software company Infi publishes one larger puzzle in the style of Advent of Code. You read the story, download your personal input, write a program in any language, and type the answer into a terminal-style box. A second part follows. The 2025 puzzle simulated trees growing on a hexagonal grid under a spotlight that circles the forest.
Free · No login · Browser · Intermediate
About Infi Advent of Code
It trains simulation, grid geometry and careful reading of rules. It suits intermediate programmers who enjoy Advent of Code. The puzzles are written in Dutch.
It runs in the browser, is free and needs no account. Every edition since 2017 stays playable.
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