Chess Codex vs Increment

Chess Codex is a calm, beautiful place to get sharper at chess. 20000+ hand graded puzzles take you from your very first checkmate to tactics that will test a club player. Every puzzle is a real position with one best move to find. Spot the fork, land the pin, set up the mate. Play offline, anywhere. No account, no sign up, no clutter. Chess Codex is part of Penrose Park Puzzles, a family of premium puzzle games.

Increment is a fast, arcade-style mental math game that turns simple arithmetic into a test of speed and reflexes. The rule is simple: you're shown a number and an instruction, such as "Add 1 to each digit." Type the transformed number before the timer runs out. 125 → 236 Easy? Now do it in a second and a half. Then the digits roll over, so 9 becomes 0. The increment grows to +2, then +3. The numbers get longer and the clock gets shorter. VS: RACE A FRIEND Play 10 numbers and send the link. Your friend gets the same 10 numbers with your time on the clock for each one, so every number is a race. The faster answer takes the point. Pick an avatar and your country flag; they appear on every challenge you send. Works between iPhone and Android, no account needed. DAILY One puzzle a day, the same 20 numbers for everyone. Keep your day streak going and share your result grid. MODES • VS: race a friend's time on the same 10 numbers • Classic: build streaks, level up, three misses and you're out • Daily: one shared puzzle a day FEATURES • Player profile with your avatar, flag and stats • Quick runs and instant restarts • Game Center leaderboards for Classic and your Daily streak • Digit roll-over (9 → 0) that keeps every answer honest • Clean, high-contrast design built for one-handed play • Optional one-time Remove Ads upgrade No accounts. No distractions. Just you, the numbers, and the clock.