The World Puzzle Federation‘s rolling Puzzle Grand Prix contest has its fifth round this weekend. It’s a free-to-enter online puzzle contest where you are given an hour and a half to score as many points as you can by solving paper-and-pencil puzzles. You can start at any point after 11am UK time on Friday and must conclude by 11pm UK time on Monday.
This fifth round is particularly interesting to this site because it’s being set by puzzle authors from the US who have chosen to theme some of their puzzles in the “casual” section around what they’re calling “Escape the Grand Prix”. For all intents and purposes, don’t worry about the distinction between the “casual” and “competitive” sections unless you’ve been solving every round and getting almost all the “competitive” puzzles correct; just solve whichever puzzles seem most entertaining, whichever section they’re in.
“You are trapped in a room with a stack of puzzles, wondering if you’ll be able ((to)) finish all of them. Between you and the end is one Mastermind puzzle. But it seems to be in code, with twenty different letters corresponding to different digit values from 1 to 9 (e.g., X = 2 or Y = 6). Perhaps solving the other puzzles, some normal in appearance and others with some of the same code letters, will help. Not all puzzles will be useful to crack the code, but you never know where important clues will be found so search everywhere. Can you figure out what digit each letter stands for and ‘Escape the Grand Prix’ before time runs out?”
Take a look at the Instruction Booklet which is a 3.3 MB .pdf file; the booklet hints at the sort of tricks it might use to secrete digits’ identities throughout and also shows you what other types of puzzles there will be on offer in the contest. The contest goes out of its way to offer puzzles in a wide range of levels of difficulty, and you know what styles of puzzles will be featured in advance so you can have a good idea whether you’ll enjoy them or not. You can even get some practice in on the types of puzzles that you know you’ll be facing in advance, if you like. The first four rounds were great fun and this one should be even more so!