I had a great time with this.
You need to go to the supermarket for milk, and possibly some MagiMuffins. Except this is no ordinary supermarket! Enigmart has an app which will give you generous discounts - so far, so 2026, except here you have to solve puzzles to get your 25% off.
The puzzles, mostly food-themed, were excellent - mostly pitched at the right level to get my brain going without being too hard. I had to come back to some of them and think again (the Creatine Crunch cereal was maddening until the penny suddenly dropped). And every one gave me that wonderful sense of satisfaction when I figured it out. A hint system is offered relatively late on in the game - I needed to use it twice.
There is a subgenre of IF which deals in wordplay and puzzles, and this is a worthy addition to it. Well done!