Intellectual Decathlon is a 1984 computer game for the Apple II. It pits one player's intelligence against another's, both on the same computer. It contains no trivia, no actual knowledge needed, only intelligence. In a way it is an IQ competition. Intellectual Decathlon was written by Gabor Laufer, M.D.
Not in any scientific fashion, but the game is made of ten different events (sub-games) which tests ten different aspects of the human intelligence. The more intelligent a person is, the more likely to score higher. The score is structured like in the real olympic decathlon, with about the same range too. The scores of the individual ten events are added up and the final score is the total of the ten individual events.
All ten events are randomly generated/presented every single time one plays the game, thus it is not possible to learn it, as far as learning the solutions (the events are not typical puzzles but rather logical tasks).
The ten events:
1. Numberstretcher: The computer presents longer and longer string of numbers what the player has to memorize (presented only for a few seconds) and type back.
2. Note the Notes: The computer plays a short random tune, 6-8 bars. Then the computer starts playing a long sequence of random notes and without notice at one point the initially presented short tune is played (hidden within the long tune). That is what the player has to identify.
3. Safecracker: The computer presents 9 dials on the screen (3x3) and a single hand in each dial points to either 12,3,6 or 9 o'clock. With key combinations the player has to set as many dials to 12 as he can. For example, pressing number 1 on the keyboard will rotate dial 1,2,4,5 90 degrees clockwise. None of the dials can be individually adjusted.
4. Mazerace: A randomly generated maze appears on the screen. Player 1 is in the lower left corner, Player 2 is in the upper right corner. They have to get to each other's starting point (played at the same time).
5. Apple Derby: An imaginary horse race where the players bet their points earned during the first four events. No luck is involved, it is all pure logic. The race is pre-determined (although looks random). The moment the horses take off, the program knows exactly which horse will win (by design). That's what the players have to figure out from presented data from those horses' previous history of success.
6. Lying digits: Ten simple (four basic operations) math problems are flashed on the screen with the solution which is either wrong or right. That's all the players has to indicate.
7. Matchmaker: Ten wordpairs are displayed in two columns for 30 seconds. Then the program clears the display and places only one column words back on the screen and displays the other column words one by one. The player has to match the word with its pair.
8. Brainblender: An abstract board game, great deal of memory, strategy and combination is involved. The two players are playing it at the same time.
9. Instant Replay: The program flashes a "picture" on the screen (primitively drawn objects). Then another picture comes on the screen. It is either exactly the same or one object is not the same. That is what the simultaneously playing players have to determine (same, different).
10. Abstrajig: A randomly generated abstract picture comes on the screen, cut into 16 pieces, shuffled, and the player has to put it back together as in a jigsaw puzzle.
There is a practice mode, where each of the ten events can be practiced separately from a competition.
While it is a game for 2-6 players, and the 2 players setup is the most recommended, one player can play the game. In that case the goal is not to defeat the other player, but simply score higher than before.
In the PC Apple emulator based Intellectual Decathlon (the one available now) Mazerace was replaced with the following alternate 4th event:
Verdict Guilty: Five imaginary criminals are sitting at the police station, all five arrested. Only one committed a crime the other four is innocent. They are keep talking to each other and the player has to figure out which of the five is the guilty one and what the crime he committed.
Reason for the replacement: Mazerace required a minimal eye-hand coordination skill.