D/Generation vs OZO
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
D/Generation
Embark on a rescue mission in a corporate building overrun by biogen weapons. Deliver packages, save hostages, and uncover the truth across 10 interconnected levels.
- Rescue hostages
- Explore 10 levels
- Fight biogen weapons
- Uncover corporate mystery
- MFi controller support
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D/Generation was an acclaimed game on PC, Amiga and ST back in the 1990s. Developed from the original source code by the original Amiga & ST programmer, this app has the complete game beloved of many, the first level is free with the full game available with an InApp purchase. For newcomers to the game, you are a delivery man tasked with delivering a package to a large corporation. Once there you discover the building has been taken over by biogen weapons and there are many people that need to be rescued. You take on the task of rescuing these people and discovering what went wrong. Played over 10 levels of interconnecting rooms, this version is the same as the version names D/Generation on Switch. Supports MFi controllers.
OZO
Defend the ocean from a zombie invasion by assembling a team of diverse sea creatures. Strategize your defenses, unlock unique abilities, and upgrade your units through challenging missions and daily challenges.
- Diverse sea creature units with unique abilities
- Challenging missions across various levels
- High-quality underwater graphics and animations
- Customizable upgrades for units
- Daily challenges and rewards
- Strategic defense gameplay
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Dive into epic battle with "Ocean Zombie Outbreak". The once peaceful marine world is now under attack by terrifying zombies! Join forces with an incredible array of sea creatures and protect your underwater home from the zombie invasion. You and your underwater army are the last line of defense preventing complete devastation, as zombies have already taken over the land with their undead forces. Prepare yourself for an underwater adventure like no other! In Ocean Zombie Outbreak, the fate of the ocean lies in your hands. Assemble your team of brave sea creatures and defend your aquatic home against relentless waves of zombie invaders. Diverse Sea Creatures: Unlock and command a variety of sea creatures, each with unique abilities. From the humble fish to mighty sharks, create your ultimate defense team. Challenging Missions: Battle through countless levels and astonishing backdrops. With every passing level you will fight new and tougher zombie threats. To counter the advanced attacks, strategize your defenses and effectively utilise your abilities. Breath-taking Graphics: Experience a stunning underwater world with high-quality graphics and animations that bring your ocean adventures to life. As you navigate through the levels of the game, you will descend into the depths of underwater world filled with wonder. Customizable Upgrades: Power up your sea creatures with customizable upgrades to enhance their abilities and ensure victory against horde of different kinds of zombie. Daily Challenges and Rewards: Complete daily challenges to earn special rewards and participate in unique events for exclusive bonuses. JOIN THE DEFENSE: The ocean needs a hero! Lead your team of sea creatures against the relentless zombie outbreak. Strategize, defend, and reclaim the deep blue in this thrilling battle for survival.
Screenshots
Verdict
The clearest difference is review sentiment: OZO at 100% against D/Generation's 21%. OZO also leads on update cadence (fortnightly vs monthly). D/Generation's advantage is ads (none vs shown). On price, in-app purchases, monetization model 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. D/Generation sells 1 one-off in-app purchase and OZO sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
D/Generation ships an update monthly, OZO fortnightly. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.
| Parameter | D/Generation | OZO |
|---|---|---|
| Price | Free | Free |
| Rating | 2.4 (7 ratings) — better | — |
| Positive reviews | 21.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 7 — better | — |
| Update frequency | Monthly | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 29 MB | 432 MB |
| Age rating | 9+ | 9+ |
| Developer | Bay Software Development Ltd | COCOBOO Games |
Customer experience
D/Generation
OZO
In-app purchases
D/Generation
- Unlock all levels and remove ads$0.99
OZO
- Quick Boost$0.99
- Piggy Bank$0.99
- Remove Interrupted ads$0.99
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- Power Surge$1.49
- Action Vault$1.79
- Flash Forward$1.79
- Turbo Deal$2.09
- Infinity Bundle$2.59
- VIP Membership$4.99
- Mega Gem Pack$12.99









