Sum Within

Sum Within - Number Logic Puzzle Game

Sum Within is a challenging number logic puzzle game that exercises your logical thinking and mathematical skills through a unique sequence rule.

Game Rule:
Each sequence follows a specific mathematical formula: a[i] = a[i-1] + a[i-2] - i
You need to deduce the missing numbers based on the given numbers to complete the entire sequence.

Four Game Modes:
Classic Mode - One mistake ends the game, challenging your accuracy
Timed Mode - Answer as many questions as possible in 90 seconds, testing speed and precision
Endless Mode - Continuous challenge with 5 allowed mistakes
Daily Challenge - One special puzzle each day, compete with players worldwide

Three Difficulty Levels:
Easy - 5 numbers, 1 blank, range ±50
Medium - 6-7 numbers, 2 blanks, range ±100
Hard - 8 numbers, 3 blanks, range ±200

Game Features:
Clean and elegant interface design
Smooth animations and haptic feedback
Complete game history tracking
Detailed solution explanations

Perfect For:
Players who enjoy math and logic puzzles
Students looking to improve mental calculation skills
Users seeking casual brain-training games
Players who enjoy challenging themselves

Download Sum Within now and start your number logic journey. Show More