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Fingertips: Who's Knockin' On The Wall?

by Melvin Rangasamy

Episode 27 of Apollo 18 Tribute Album
Logic Puzzle

Web Site

(based on 5 ratings)
2 member reviews

About the Story

You live in a vibrant international community, in all senses of the word 'vibrant'. But who is that knocking on the wall?

A completely randomised logic puzzle for Apollo 18+20: The IF Tribute Album.

Game Details

Language: English (En)
Current Version: 1
Development System: Inform 7
IFID: CC8A14AD-7452-46AC-8E53-91AF920ADBC2
TUID: n50qfej14uyuyurp


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Number of Reviews: 2
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A classic logic puzzle (the kind you solve with a grid), February 13, 2016
This one move game is more puzzly than most games in the Fingertips portion of the Apollo 18 album.

It is a classic logic puzzle, where you are given a dozen or so facts about several people and several properties they have, and you have to deduce who is next to you.

Because I wasn't in the mood for this puzzle, I just guessed, and go it right. Good for fans of such puzzles.

A Perfect Logic Puzzle Generator, April 1, 2012
by Joey Jones (UK)
Who's Knockin' is a logic puzzle (or set of possible puzzles) with the same form as the (probably apocryphal) Einstein Puzzle, also known as the Zebra Puzzle. It's a fun and challenging puzzle to solve even if you don't have a degree in predicate logic. The trouble is, if you've solved it once, you always know what the answer is. Not so any more!

If Who's Knockin' merely randomised the names of all elements in the puzzle, then you'd always be able to guess the answer just by looking at the form of the clues: if, for instance, the woodworker is always the person that lives in the second house, you could guess it every time just by looking at the clue saying who lives in the second house. What the game engine does is randomly pick one of five possible puzzle structures (all sharing some identically structured clues), and then it randomises the order in which the clues are listed. This essentially means the game can't be 'gamed', you have to figure it out afresh each time.

While it lacks literary qualities and breadth of response, the game more than achieves what it sets out to achieve: a challenging and unique puzzle with every play. And that's not something many games can boast, let alone one move games.

If you enjoyed Fingertips: Who's Knockin' On The Wall?...

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Recommended Lists

Fingertips: Who's Knockin' On The Wall? appears in the following Recommended Lists:

Apollo 18+20 by Teaspoon
Interactive fiction games, with one game per track on the album Apollo 18 by They Might Be Giants. The regular tracks are generally short games. The Fingertips tracks are one-move games (however the authors interpreted that). The games...

Recommended list by DAB


The following polls include votes for Fingertips: Who's Knockin' On The Wall?:

Games with great puzzles by Molly
Games that have great puzzle-design. The puzzles need to be logical and internally consistent.

Games with "logical" puzzles by Victor Gijsbers
Some puzzles--like chess problems or sudokus--can be difficult even though you know all the rules. I'm looking for IF games with this kind of puzzle: you can get to know the rules by simple exploration, and then you still have to solve...


This is version 4 of this page, edited by Teaspoon on 27 March 2016 at 4:37pm. - View Update History - Edit This Page - Add a News Item