Prime Sieve

Objective

Numbers fall from 2 upwards. Blast the composites and leave the primes. Reach the target score with lives remaining.

Rules

• Tap a composite to destroy it and score. Bigger composites with more prime factors score more.
• Tap a prime and you lose a life.
• A composite that reaches the bottom also costs a life. A prime that reaches the bottom escapes correctly and scores 2.
• You have 3 lives. The run ends at 0 lives, or when you hit the target score.

Difficulty

• Easy: numbers 2 to 30, slower fall, target 100. Primes have a tiny gold corner mark.
• Classic: numbers 2 to 60, target 180.
• Hard: numbers 2 to 97, faster, target 260. No marks.

Daily challenge

Everyone receives the same seeded spawn sequence at Classic speed. Target 180. It resets at midnight UK. The first finish of the day counts for the league and your streak.