Brain Test Level 213 Walkthrough & Answer

## Question **Brain Test Level 213:** What is the sum of all numbers from 1 to 100? ## Answer The answer is 5050. Use the formula: n(n+1)/2 = 100(101)/2 = 5050. ## Step-by-Step Walkthrough This is Gauss's famous problem. Instead of adding 1+2+3+...+100 individually, use the formula: 100 x 101 / 2 = 5050. Enter 5050. Here is exactly how to solve Brain Test Level 213: 1. Read the question carefully — Brain Test loves wordplay and misdirection. 2. Look at every element on screen, including the question text itself. 3. Use Gauss's formula: 100 x 101 / 2 = 5050. 4. If you are stuck, remember that Brain Test rewards lateral thinking over logical answers. ## Why It's Tricky This is a genuine math challenge with no trick — rare for Brain Test at level 212. The difficulty is pure arithmetic. Players who know Gauss's formula solve it instantly; others may try to add numbers sequentially and run out of time. ## Why This Level Is Tricky Difficulty 4 puzzles in Brain Test often involve meta-awareness — the solution might require interacting with your phone's hardware (volume buttons, tilt sensor) or manipulating the game's UI elements. The puzzle boundary extends beyond the screen content to include the device itself. Late-game levels (151-300) frequently require device interaction — tilting your phone, using multiple fingers, shaking the device, or manipulating screen elements outside the puzzle area. Think beyond the touchscreen for these multi-step solutions. ## Common Mistakes Players frequently make these errors on Level 213: - Overthinking a simple puzzle — sometimes the answer is literally what the question says, with no trick at all. - Not trying to drag or resize on-screen elements, including text, images, and answer options. - Missing that Brain Test sometimes reuses a trick from an earlier level with a slight variation.