Cross Number vs Missing Digits

Fill the empty cells so every equation balances — across and down. Cross Number is a math crossword: each row and each column is an equation, and one wrong digit breaks both. Every puzzle is generated on your device and checked for a single solution before you ever see it. Most number games test speed. This one rewards deduction. Start from the digits you can prove, pencil in candidates where you can't, and feel the grid click into place. A timer runs on every board, but only your star rating cares about it — the puzzle itself waits as long as you do. WHAT YOU GET • 200 levels across Easy, Medium, Hard, and Expert — from gentle addition grids to 9×9 monsters mixing all four operations • A Daily Challenge that is the same puzzle for everyone that day, with a streak calendar showing every date you kept alive • Endless mode with a personal best to beat in each difficulty tier • Pencil notes and undo, so a wrong guess costs you seconds, not the whole grid • Error checking that lights up the exact row or column that stopped balancing • Stars, coins, and hints earned by playing — hold a streak for seven days and the game pays you 50 coins PERFECT FOR • Commuters who want a puzzle that fits a train ride and works in airplane mode • Sudoku regulars ready for grids where arithmetic joins the logic • Adults keeping mental math sharp without flashcard drills • Anyone winding down at night who prefers deduction to doomscrolling WHY NOT JUST SUDOKU? Sudoku asks where the numbers go. A math crossword asks what the numbers are — every digit you place has to survive both its row's and its column's arithmetic, so one compact grid works your calculation and your logic at the same time. PRIVATE BY DEFAULT No account, no ads, no tracking. Puzzles are generated on this device, and your progress, streaks, and best scores stay on it. The game works offline; the App Store is contacted only to handle your purchase. FULL ACCESS Cross Number is a paid game with no free tier. One plan opens the whole of it — weekly, yearly, or lifetime (one-time purchase): all four difficulties, all 200 levels, the Daily Challenge, every Endless tier, and unlimited hints. Download Cross Number and open today's Daily Challenge — your streak calendar starts with tonight's date. Payment will be charged to your Apple ID account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your account settings on the App Store after purchase. Terms of Use: https://leanstudio.asia/terms-of-use Privacy Policy: https://leanstudio.asia/privacy-policy Support: support@leanstudio.asia

Guessing won't fill the blanks. Logic will. Follow the carry from the ones column, and every hidden digit narrows to a single answer. Missing-digit arithmetic and classic cryptarithms, in one quiet app. • Free to start. No subscription • No third-party ads • Your records stay on this device ■ Your first puzzle Your first puzzle walks you through it, one column at a time. No need to know the rules. You can replay it anytime from How to Play in Settings. ■ Missing digits Part of a written sum is hidden. Fill in the blanks so the arithmetic works. • Easy: column addition • Normal: addition and single-digit multiplication, chosen so you can't just subtract your way through • Hard: long multiplication with partial products • Oni: 4×3-digit and 5×2-digit long multiplication Puzzles are generated on your device, so you never run out. ■ Cryptarithms Letters stand for digits, as in SEND + MORE = MONEY. Same letter, same digit; different letters, different digits. 119 puzzles built from everyday English words. ■ Exactly one answer Each puzzle starts as a completed sum, and digits are hidden only while a single answer remains. Every cryptarithm was chosen because it has one solution. ■ Today's puzzle and ranks One puzzle a day, the same for everyone. Weekdays are Normal; weekends are Hard long multiplication. Earn points as you solve and climb from 10th Kyu to Master. Your streak and a calendar keep your history visible. ■ Quiet help • Columns that can't work out are gently tinted (you can turn this off) • If you're truly stuck, a hint reveals a single cell ■ Chalk on a blackboard Deep green board, chalk-white digits, set vertically the way you'd write by hand. The board lights up gold when you solve it. On iPhone and iPad, the board grows to fit your screen. ■ Great for • Sudoku and crossword fans who want puzzles that actually use arithmetic • Anyone who'd rather deduce than drill • Kids preparing for entrance exams, and their parents • Building a small daily brain-training habit • Playing on planes and trains with no signal ■ Privacy • No account required • Puzzles are created inside the app; no connection needed to play • No tracking • To show other apps by the same developer, the app reads public App Store listings only. None of your data is sent