Mark Sweep's puzzles

Last year I had the pleasure to create some puzzles for the UK Puzzle Championship. Basically I was asked to create some well-known types, some more unfamiliar ones and perhaps a few variants. The UKPC was divided into two rounds of 90 minutes each, with 540 points up for grabs in each round (so 6 points per minute). Round 1 can be found here and round 2 can be found here .  Below you can find the puzzles I created.   1.1 Mastermind (10 points) I always like a small word puzzle in contests. That's why I created this one with mostly (stereo)typical words associated with the UK. Rules Identify a secret code comprised of letters (digits in the example). Each row represents a guess at the secret code, with black dots identifying letters that are in the correct position and white dots letters that are in the guess but in a different position to the code. The dots are given in no specific order, and each letter in the secret code contributes at most one dot, with black dots given p...

This puzzle was made for a speed setting contest on the CTC Discord server. The assignment was to make a simple loop with one rule change within 60 minutes. For some reason I immediately thought about my favorite round from WPC 2021: Night and Day. So, I made one with a double loop. Enjoy! Rules Draw two loops in the grid, such that all empty cells are visited. A loop cannot touch or intersect itself. The two loops can intersect each other without turning, but may not touch each other otherwise. Solve online