Slime Up！ vs Isseki
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Slime Up！
Build intricate block structures that defy gravity to defend against enemy waves. Merge and upgrade your defenses to create a powerful fortress. Test your engineering and strategic skills in this unique puzzle-tower defense hybrid.
- Physics-based block building
- Merge and upgrade hero blocks
- Real-time enemy defense
- Creative strategic building
- Boss battles
- Fortress repair and fortification
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Slime Up! —A unique blend of block puzzles and tactical tower defense. Forget static towers. In this game, your defense is a structural masterpiece built block by block. Every classic shape must be placed with precision, as real-time physics and gravity will test the integrity of your fortress. Game Features: Build with Physics: Use classic block shapes to build your base. Watch your center of mass! Real gravity means your tower can tilt and collapse under enemy fire. Merge & Upgrade: Drag and drop identical hero blocks to merge them. Unlock higher-tier turrets and turn your puzzle into a massive wall of firepower. Creative Strategy: You have total freedom. Use awkward shapes to wedge gaps or reinforce your foundation. Your engineering skills are your best defense. Defend the Core: Survive relentless waves of enemies and giant Bosses. Stack, repair, and fortify in real-time to keep your stronghold standing. Ready to beat gravity? Download Slime Up! and start building now!
Isseki
Test your reflexes and speed by hitting targets in a daily challenge. Achieve perfection to become a legend. Compete with others globally on the same daily sequence.
- Daily global challenge sequence
- Test instinct, reaction, and speed
- Unlimited training with one-off unlock
- No ads or sign-up required
- Game Center integration for leaderboards
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Instinct, reaction, speed — try and hit all 500 marks. Miss one or leave one too long and the game is over. Those who hit all 500 become legends. Everyone in the world gets the same new sequence of marks each day. It changes at midnight in Japan. Your best rounds stay on your phone, and Game Center shows you where you stand on today's sequence. Three free rounds a day to train. A round only counts once you've hit 10 marks, so learning is free. When you're ready to train without limits, Unlimited Rounds is a one-off unlock. There are no ads and nothing to sign up for. A game by Pure Golf Tour
Screenshots
Verdict
The clearest difference is review sentiment: Isseki at 100% against Slime Up！'s 36%. Isseki also leads on rating (5.0 vs 4.1) and ads (none vs shown). Slime Up！'s advantage is ratings volume (240 vs 1) and monetization model (ad-supported vs freemium). On price, in-app purchases, 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. Slime Up！ sells 10 one-off in-app purchases and Isseki sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Isseki holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: Slime Up！ has 240 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 36% of Slime Up！'s written reviews are positive against 100% of Isseki's.
Slime Up！ ships an update monthly, Isseki every 2 days. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.
| Parameter | Slime Up！ | Isseki |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (240 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 35.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 240 — better | 1 |
| Update frequency | Monthly | Every 2 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Ad-supported — better | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 219 MB | 7 MB |
| Age rating | 9+ | 4+ |
| Developer | ZPLAY (HK) TECHNOLOGY CO., LIMITED | Pure Golf Tour Ltd |
Customer experience
Slime Up！
Isseki
In-app purchases
Slime Up！
- 1-Day Speed Boost$0.99
- Starter Pack$1.99
- Chapter Pack 5$1.99
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- Ad Skip Ticket 1$2.99
- Remove Ads Pack$4.99
- Ad Skip Ticket 2$7.99
- Premium Bundle$9.99
- Golden Pass$12.99
- Permanent Speed Boost$14.99
- Ad Skip Ticket 3$19.99
Isseki
- Unlimited Rounds$1.99
