Missing Digits vs Neon Spire
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Missing Digits
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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
Neon Spire
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Neon Spire is a one-tap tower builder with a single rule: tap at the right moment. A glowing block slides across the screen. Tap to drop it. Land it dead-center and the block stays full size. Miss, and the overhang is sliced off and falls away, leaving you less room for the next one. Five perfect drops in a row triggers FEVER, slowing everything down and giving you a window to build a run. HOW TO PLAY - Tap anywhere to drop the block - Perfect landings keep your tower wide - Every miss makes the next drop harder - One run takes about 30 seconds FEATURES - One-tap controls, no tutorial needed - Plays entirely offline - No forced ads between every round - One-time purchase to remove ads permanently - Free to play Built by 10percent studio.
Screenshots
Verdict
The clearest difference is in-app purchases: Neon Spire at none against Missing Digits's 1. Neon Spire also leads on update cadence (every 4 days vs monthly) and iOS requirement (15.0 vs 17.0). Missing Digits's advantage is ads (none vs shown). On price and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Missing Digits sells 1 one-off in-app purchase. Neon Spire asks for nothing beyond the download.
Missing Digits ships an update monthly, Neon Spire every 4 days. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.
| Parameter | Missing Digits | Neon Spire |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | Every 4 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 75 MB |
| Age rating | 4+ | 4+ |
| Developer | torankirite | HARADA ISSEI |
In-app purchases
Missing Digits
- Premium$4.99
Neon Spire
No in-app purchases









