Crazy Hard Fast Math Reaction vs Sigma 100
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Crazy Hard Fast Math Reaction
Test your math skills with an infinite number of calculations. Choose your difficulty and race against the clock to achieve a high score. Compete with friends on multiple leaderboards to prove your math prowess.
- Infinite math calculations
- Two-button right/wrong input
- Timed challenges
- Difficulty options (easy, normal, hard)
- Multiple leaderboards
- Multiplayer competition
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Crazy Hard Math Challenge - You get it? An infinite number of math calculations await you, 2 buttons, right or wrong, and a very short amount of time. Race the clock to get a high score, take the easy, normal or hard option, it's your choice, but with 3 different leaderboards, why not prove to your friends who is the king of math? It really doesn't get much harder than this! Are you up for the challenge?
Sigma 100
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Doing math addition by adding the numbers on the screen. The goal is to make four 100s in a row or/and seven 100s in a column to get higher bonus.
Screenshots
Verdict
The clearest difference is in-app purchases: Sigma 100 at none against Crazy Hard Fast Math Reaction's 1. Crazy Hard Fast Math Reaction's advantage is update cadence (every 11 months vs every 39 months) and iOS requirement (12.4 vs 14.0). On price, ads 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. Crazy Hard Fast Math Reaction sells 1 one-off in-app purchase. Sigma 100 asks for nothing beyond the download.
Crazy Hard Fast Math Reaction ships an update every 11 months, Sigma 100 every 39 months. The most recent releases landed on November 1, 2026 and October 27, 2026 respectively.
| Parameter | Crazy Hard Fast Math Reaction | Sigma 100 |
|---|---|---|
| Price | Free | Free |
| Rating | 1.7 (29 ratings) — better | — |
| Positive reviews | 27.3% of reviews | — |
| Number of ratings | 29 — better | — |
| Update frequency | Every 11 months — better | Every 39 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.4 — better | 14.0 |
| Further details — not scored | ||
| Size | 48 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Fragranze Games Ltd | CHIEN-HUNG CHEN |
In-app purchases
Crazy Hard Fast Math Reaction
- Remove Ads$1.99
Sigma 100
No in-app purchases
Questions
Is Crazy Hard Fast Math Reaction free?
Is Sigma 100 free?
Do Crazy Hard Fast Math Reaction or Sigma 100 have ads?
Which is updated more often, Crazy Hard Fast Math Reaction or Sigma 100?
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