New Skill Unlocked!

Select Difficulty

Game Over

Final Score: 0

Correct: 0

Level Reached: 1

Best Streak: 0

Difficulty: Medium

How to Play

Type the Python slice that selects the highlighted characters.

Indexing

Each character has a position (index) starting at 0:

"hello" → h=0, e=1, l=2, l=3, o=4

• a[0] → first character
• a[2] → third character
• a[-1] → last character
• a[-2] → second to last

Slicing

Select a range with [start:stop] (stop is excluded):

• a[1:4] → characters at index 1, 2, 3
• a[:3] → first 3 characters
• a[2:] → from index 2 to end

Step

Add a step with [start:stop:step]:

• a[::2] → every 2nd character
• a[1::2] → every 2nd, starting at 1
• a[::-1] → reverse the string

Symbols

• ←| Use negative index (from end)
• ← Use negative step (reverse)

Keyboard Shortcuts

• ↓ Speed up spawn rate (resets each level)
• Esc Close this help