Advent of Code 2025

Maybe this year i complete it

Pick a day and step to jump into the puzzle solver. More days will appear as they’re added.

Day 1

Secret Entrance

Dial rotations and password counting

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Step 1

Password by endpoints

Counts zeros at the end of each rotation.

Step 2

Password by every click

Counts every click that lands on 0.

Day 2

Gift Shop

Double-stamped product IDs

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Step 1

Find doubled patterns in ranges

Finds IDs that are two identical halves.

Step 2

Any repeated pattern, 2+ times

Finds IDs with any pattern repeated two or more times.

Day 3

Lobby

Emergency escalator batteries

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Step 1

Strongest two-battery joltage

Pick the best ordered pair of batteries in each bank.

Step 2

Twelve-battery override

Pick the best ordered twelve digits per bank.