Comparison

D/Generation vs OZO

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

Head to head
About

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.

Highlights
  • Rescue hostages
  • Explore 10 levels
  • Fight biogen weapons
  • Uncover corporate mystery
  • MFi controller support
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

D/Generation1 screens
OZO4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

D/Generation ships an update monthly, OZO fortnightly. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

Scorecard3 real differences · 7 level
D/Generation versus OZO: the parameters behind the verdict, then further details
ParameterD/GenerationOZO
PriceFreeFree
Rating2.4 (7 ratings) — better—
Positive reviews21.1% of reviews100.0% of reviews — better
Number of ratings7 — better—
Update frequencyMonthlyFortnightly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size29 MB432 MB
Age rating9+9+
DeveloperBay Software Development LtdCOCOBOO Games

Customer experience

D/Generation

All ratings7 ratings
Positive28.6%
Neutral14.3%
Negative57.1%
Written reviews19 reviews
Positive21.1%
Neutral15.8%
Negative63.2%

OZO

Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

D/Generation

One-time1
  • Unlock all levels and remove ads$0.99
10 purchases

OZO

One-time10
  • Quick Boost$0.99
  • Piggy Bank$0.99
  • Remove Interrupted ads$0.99
Show 7 more
  • 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

Questions

Is D/Generation free?
D/Generation is free to download, with in-app purchases available.
Is OZO free?
OZO is free to download, with in-app purchases available.
Do D/Generation or OZO have ads?
OZO shows ads; D/Generation does not.
Which is updated more often, D/Generation or OZO?
D/Generation ships an update monthly, and OZO fortnightly. Most recently, D/Generation was updated on November 1, 2026 and OZO on November 4, 2026.

Other comparisons