Number Time vs ISUD Zero
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Number Time
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1. About this game Number Time is a simple puzzle game where players match and erase blocks with number from 0 to 6. - Numbers Change by Addition Overlapping two blocks will change the number of the moved block to the sum of their numbers. - How to Erase Blocks If you match two blocks or more and tap one of them, a rectangular frame will appear, then if you tap it, you can erase the blocks in it and get points. - How to Play You can play the game in the score attack mode and the time attack mode. - Two Games There are “All Numbers” and “Number 6” games. In the former you can erase all types of blocks, but in the later you can erase only “number 6 blocks”. Each game tutorial will teach you each rule in the app. - Support Rankings If you sign in to Game Center and play this game, you can compete with players around the world for score and time. Aim for the top rankings! - Ad Display In order to make the app available for free except for some features, ads are displayed within the app. 2. In-App Purchase Items - Remove Ad This item removes the ad. Furthermore, You will be able to play games offline: you will need to be online to participate in the rankings. - Unlock 7 Game Modes This item unlocks 7 special game modes. A specific block does not appear in these modes. - Unlock Endless Mode This item unlocks endless mode. In standard mode, you end the game by erasing 480 blocks, but in endless mode, you can push the envelope for the score without ending the game. For your information, there is also a theoretical upper limit in this mode. - Unlock No-Drop Mode This item unlocks no-drop mode. In standard mode, blocks drop after the block operation, but in no-drop mode, those don't drop. This item is only valid for the game "Number 6”. This software includes the works that are distributed in the Apache License 2.0.
ISUD Zero
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Dodge readable bullet patterns, graze for Phase Pulse, and chase clean weekly scores against the Pattern Engine. Description: I.S.U.D. Zero is a portrait bullet-hell boss rush built around clean reads, a tiny fair hitbox, and fast retry mastery. Enter the simulation chamber, learn each boss pattern, graze close calls to charge Phase Pulse, and chase cleaner clears across The Instructor, Mirror Cadet, Twin Array, and The Cartographer. Every run is short, sharp, and score-driven. Bosses move, mutate, and escalate through multiple phases. The ship only takes damage at the red core, so the chaos stays readable even when the screen blooms with bullets. Features: - Precision drag controls for portrait play - Fair red-core hitbox with optional callout - Graze scoring and Phase Pulse screen clears - Four multi-phase bosses with distinct patterns and visual escalation - Five additional boss slots marked Coming Soon - Difficulty options, persistent best scores, and ranks - Game Center weekly and all-time high score leaderboards - Neon arcade presentation with original audio hooks
Screenshots
Verdict
The clearest difference is in-app purchases: ISUD Zero at none against Number Time's 4. ISUD Zero also leads on ads (none vs shown). On price, device support and iOS requirement 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. Number Time sells 4 one-off in-app purchases. ISUD Zero asks for nothing beyond the download.
| Parameter | Number Time | ISUD Zero |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly | — |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 65 MB | 119 MB |
| Age rating | 4+ | 12+ |
| Developer | Masaru Kimura | Suwitcha Sugthana |
In-app purchases
Number Time
- Remove Ad$0.99
- Unlock Endless Mode$0.99
- Unlock No-Drop Mode$0.99
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- Unlock 7 Game Modes$1.99
ISUD Zero
No in-app purchases









