Protocol 4 vs Zen Island
Price, ratings, monetisation and update history for both games, side by side โ with what reviewers say about each.
Protocol 4
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Crack the code before your rival does. Protocol 4 is a hacker game of pure deduction. Every guess gives you signal readings; you break the passcode with logic, not luck. Play solo, take on the Daily Operation, or duel another operator in real time. REAL-TIME PvP DUELS Race: one passcode, two operators. First one through wins. Standoff: each of you sets the code the other must break. Two codes, one clock, and you watch them close in on yours. Outsmart your rival and claim the reward. DAILY OPERATION A new code every day, the same for everyone. Crack it, climb the daily leaderboard and earn double XP. BUILD YOUR EMPIRE Assemble mining rigs, expand your vault, and run overclocks. Your network keeps earning credits while you are away. SYNDICATES AND TERRITORY Join one of three syndicates, claim territory on the map, and take your share of the pot that every raid feeds. RAIDS Break into a rival operator's grid and take what they left unguarded, then set your own defenses before they come for you. GLOBAL LEADERBOARD Earn XP and climb fifteen ranks to become the ultimate Server King. MORE WAYS TO PLAY Quick Hacks for fast action, Training to sharpen your deduction, and 18 career contracts plus fresh daily missions. ARSENAL OF TOOLS Oracle Scan, Double XP and more hacking tools to gain the upper hand when a code will not give. Play in English, Turkish, Spanish, French, German or Portuguese, on iPhone and iPad. Are you ready to initiate Protocol 4?
Zen Island
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Place buildings. Watch them merge. Find your flow. Zen Island is a cozy hex-grid merge puzzle set on a peaceful island. Tap to place buildings on a 19-tile hexagonal grid โ when three or more matching buildings sit side by side, they merge into something grander. A humble sprout becomes a tree, a tree becomes a house, a house becomes a villa, and beyond that, wonders await. There are no timers, no lives, no stress. Just you, the island, and the gentle satisfaction of a perfect merge cascade. - Merge mechanics โ connect 3+ same-level buildings to level them up; chain combos multiply your score - Hex grid strategy โ every placement matters when space is limited - 5 unlockable themes โ earn score to reveal new color palettes and dress your island your way - Plays offline โ no network required, ever Whether you have two minutes or two hours, Zen Island is always ready to welcome you back.
Screenshots
Verdict
The clearest difference is in-app purchases: Zen Island at none against Protocol 4's 7. On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Protocol 4 sells 7 one-off in-app purchases. Zen Island asks for nothing beyond the download.
| Parameter | Protocol 4 | Zen Island |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | โ |
| Ads | Yes | Yes |
| In-app purchases | Yes | No โ better |
| Devices | iPhone, iPad โ better | iPhone |
| Requires iOS | 17.0 | 16.0 โ better |
| Further details โ not scored | ||
| Size | 12 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | HAKAN OZGER | Niv Nisanov |
In-app purchases
Protocol 4
- Pocket Change$0.99
- Starter Kit$1.99
- Agent License$2.99
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- Hacker's Stash$4.99
- Pro Kit$4.99
- Trust Fund$9.99
- Master Kit$9.99
Zen Island
No in-app purchases









