Comparison

Missing Digits vs Neon Spire

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Missing Digits

Read full description

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

About

Neon Spire

Features
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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

Missing Digits4 screens
Neon Spire4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Missing Digits sells 1 one-off in-app purchase. Neon Spire asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 2 level
Missing Digits versus Neon Spire: the parameters behind the verdict, then further details
ParameterMissing DigitsNeon Spire
PriceFreeFree
Update frequencyMonthlyEvery 4 days — better
AdsNo — betterYes
In-app purchasesYesNo — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.015.0 — better
Further details — not scored
Size1 MB75 MB
Age rating4+4+
DevelopertorankiriteHARADA ISSEI

In-app purchases

1 purchases

Missing Digits

One-time1
  • Premium$4.99
None

Neon Spire

No in-app purchases

Questions

Is Missing Digits free?
Missing Digits is free to download, with in-app purchases available.
Is Neon Spire free?
Neon Spire is free to download, with no in-app purchases.
Do Missing Digits or Neon Spire have ads?
Neon Spire shows ads; Missing Digits does not.
Which is updated more often, Missing Digits or Neon Spire?
Missing Digits ships an update monthly, and Neon Spire every 4 days. Most recently, Missing Digits was updated on October 25, 2026 and Neon Spire on October 29, 2026.

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