A Game of Number Guessing © 1976 People's Computer Co.
The twist is that the number to be guessed changes each turn. The computer has a base number and a jump number in mind, both are randomly chosen. The player must guess the base number, but after each guess the base number is increased by the jump. When exceeding 100 the number wraps around. The player is told the difference between his number and the base after each turn.
Released in November 1976.
Written by: Mike Firth
SWTPC 6800 (1976)