Dotball vs Missing Digits

Four ways to play one beautifully simple strategy game. Face the AI, share your phone with a friend, challenge someone online, or take on today's puzzle. The rules take one match to learn. Draw a line between two dots. Bounce off any line already drawn and keep going. Force the ball into your opponent's goal — or trap them with nowhere left to move. That's the whole game. No luck, no dice, no clutter. SINGLE PLAYER • Three AI difficulties — Easy, Medium and Hard • A genuine strategic opponent, not a pushover • Hints when you want them, Undo when you need them • Works completely offline TWO PLAYERS, ONE PHONE • Hand the phone back and forth — no second device needed • Perfect for a commute, a café or a waiting room • Works completely offline ONLINE WITH A FRIEND • Share an invite code and play 1v1 in real time • Anonymous and instant: no signup, no account, no email DAILY CHALLENGE • One puzzle a day, the same board for every player • Join a match already in progress, finish it in as few moves as you can • The fewest possible stays hidden until you solve it • Share your result without spoiling it, and keep a streak going WHY YOU'LL LIKE IT • Pure strategy — matches are decided by your decisions, not dice • Quick rounds that fit a coffee break or a train ride • Clean, focused design with smooth, tactile animations • Full dark mode, and it respects Reduce Motion • Free, ad-supported and honest — no subscriptions, no paywalls Know Paper Soccer from school? This is that game, done properly. Pick a difficulty, pass the phone, or send a friend a code — your first match starts in seconds. dotball is free and supported by ads.

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