- Day 1: Inverse Captcha
- Day 2: Corruption Checksum
- Day 3: Spiral Memory
- Day 4: High-Entropy Passphrases
- Day 5: A Maze of Twisty Trampolines, All Alike
- Day 6: Memory Reallocation
- Day 7: Recursive Circus
- Day 8: Heard You Like Registers
- Day 9: Stream Processing
- Day 10: Knot Hash
- Day 11: Hex Ed
- Day 12: Digital Plumber
- Day 13: Packet Scanners
- Day 14: Disk Defragmentation
- Day 15: Dueling Generators
- Day 16: Permutation Promenade
- Day 17: Spinlock
- Day 18: Duet
- Day 19: A Series of Tubes
- Day 20: Particle Swarm
- Day 21: Fractal Art
- Day 22: Sporifica Virus
- Day 23: Coprocessor Conflagration
- Day 24: Electromagnetic Moat
- Day 25: The Halting Problem
- Day 1: No Time for a Taxicab
- Day 2: Bathroom Security
- Day 3: Squares With Three Sides
- Day 4: Security Through Obscurity
- Day 5: How About a Nice Game of Chess?
- Day 6: Signals and Noise
- Day 7: Internet Protocol Version 7
- Day 8: Two-Factor Authentication
- Day 9: Explosives in Cyberspace
- Day 10: Balance Bots
- Day 11: Radioisotope Thermoelectric Generators
- Day 12: Leonardo's Monorail
- Day 13: A Maze of Twisty Little Cubicles
- Day 14: One-Time Pad
- Day 15: Timing is Everything
- Day 16: Dragon Checksum
- Day 17: Two Steps Forward
- Day 18: Like a Rogue
- Day 19: An Elephant Named Joseph
- Day 20: Firewall Rules
- Day 21: Scrambled Letters and Hash
- Day 22: Grid Computing
- Day 23: Safe Cracking
- Day 24: Air Duct Spelunking
- Day 25: Clock Signal
- Day 1: Not Quite Lisp
- Day 2: I Was Told There Would Be No Math
- Day 3: Perfectly Spherical Houses in a Vacuum
- Day 4: The Ideal Stocking Stuffer
- Day 5: Doesn’t He Have Intern-Elves For This?
- Day 6: Probably a Fire Hazard
- Day 7: Some Assembly Required
- Day 8: Matchsticks
- Day 9: All in a Single Night
- Day 10: Elves Look, Elves Say
- Day 11: Corporate Policy
- Day 12: JSAbacusFramework.io
- Day 13: Knights of the Dinner Table
- Day 14: Reindeer Olympics
- Day 15: Science for Hungry People
- Day 16: Aunt Sue
- Day 17: No Such Thing as Too Much
- Day 18: Like a GIF For Your Yard
- Day 19: Medicine for Rudolph
- Day 20: Infinite Elves and Infinite Houses
- Day 21: RPG Simulator 20XX
- Day 22: Wizard Simulator 20XX
- Day 23: Opening the Turing Lock
- Day 24: It Hangs in the Balance
- Day 25: Let It Snow