[I]n Trap the computer selects a random number between 1 and 100. Your object is to find the number. On each guess, you enter two numbers trying to trap the mystery number between your two trap numbers.
The game is published as type-in source code in Basic Computer Games (Microcomputer Edition), ed. David H. Ahl with Steve North, Workman Publishing, New York, 1978 (ISBN 0-89480-052-3).
The BASIC source code listing is published in Microsoft BASIC 3.0; suggestions for conversion to a wide range of other BASIC implementations are provided.