Here to help

A little help
for your dive.

Email mark@graysoftwaresolutions.com for Sharkdoku support. Tell us your device, app version, level number, and what happened.

Email support

How do I play?

Place one shark in each color region and one in every row and column. Sharks cannot touch, even diagonally. Tap a square to mark an X; double-tap the same square to place a shark. Three mistakes use up your squid lives and let you restart the level.

Need a hand?

Settings → Replay tutorial walks through the rules. Hints highlight the next safe move; Reveals place a shark for you. Version 1.0 offers free supply refills. In version 1.1, start with five hints and five reveals; when a supply runs out, the green video bubble offers one more through an optional ad. Seven-day streak chests also award free hints or reveals. Restart any level for free, or use an optional video continue to restore three squid lives on the current board. Ads require a connection and available inventory.

How does the streak work?

Complete a new progression level on each of seven consecutive local calendar days. Replaying a completed level does not count. Each day earns one fin, and day seven unlocks a free mystery chest after the win screen. Missing a day starts a new streak. Progress and streaks are local to this device.

Reminders and analytics

Reminders are optional and off until you enable them. In Settings → Puzzle reminders, choose one daily streak reminder at a time you set, or three puzzle nudges around 8 AM, noon, and 8 PM. Three-a-day nudges continue after you earn a daily fin. You can turn either choice off there. Existing one-a-day choices stay the same after updating. Your phone’s notification settings can also block them. Reminders start the next day and their delivery time can be affected by your phone’s settings.

Analytics is optional. You can change your choice in Settings → Analytics without affecting gameplay. Read the privacy policy for details.

Keeping your progress