Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time (adventofcode.com)

Article summary

The Advent of Code, a popular programming puzzle event, has reduced the number of puzzles from 25 to 12 for the first time. The change is intended to make the event more manageable for the creator, Eric Wastl, who has been running it for ten years. The puzzles will still start on December 1st and be released daily, but will now end in mid-December. This change aims to alleviate the stress and time commitment required to participate in the event.

Main themes

• Advent of Code changes
• Puzzle reduction
• Time commitment
• Programming challenges
• Event management

What commenters say

• The reduction in puzzle count is a welcome change, as it can be difficult to keep up with the daily puzzles, especially during the busy holiday season.
• Some participants appreciate the new format, as it allows them to focus on the puzzles without feeling overwhelmed by the sheer number of them.
• Others suggest that the puzzles could be released every other day to still span the entire month, aligning with the advent calendar concept.
• The change may not affect the overall enjoyment of the event, as participants can still learn and have fun solving the available puzzles.
• Some argue that the name 'Advent of Code' implies a 25-day event, and the reduction in puzzle count undermines this expectation.
• The event's creator has metrics showing that many participants drop off around the halfway mark, which may have influenced the decision to reduce the number of puzzles.
• Participants who enjoy building on previous puzzles may be disappointed by the new format, which may not allow for as much continuity between puzzles.
• The reduction in puzzle count may make the event more accessible to those who struggle to keep up with the daily pace, but may also make it less challenging for more experienced participants.