Hi there! Sorry to hear you’re seeing a black screen when trying to use the Woodoku app on your iPhone. To better assist you, could you tell me a bit more:
- Does the app open and then go black, or does it just stay black when you tap it?
- Have you tried closing the app fully and reopening it?
- Is your internet connection stable?
- Have you recently updated the app or your iOS?

Once I have these details, I can guide you through some step-by-step fixes. Meanwhile, here are some general steps that usually help resolve black screen issues with Woodoku on iOS:

1. Force Close and Reopen:
- Swipe up from the bottom and pause in the middle of the screen to open the app switcher.
- Find Woodoku and swipe it off the screen to force close.
- Reopen the app.

2. Restart Your iPhone:
- Press and hold the side button and volume button, then slide to power off.
- Turn it back on after 30 seconds, then try opening Woodoku again.

3. Check for App Updates:
- Open the App Store, tap your profile icon, and scroll down to see if Woodoku has an update.
- If yes, update the app and try again.

4. Reinstall the App:
- Tap and hold the Woodoku icon on the home screen until it jiggles.
- Tap the “X” or "Remove App" to delete it.
- Go to the App Store and reinstall Woodoku.
- Please note reinstalling might remove local game data unless it's linked to an account.

If these don’t fix it, there might be a more specific bug or device setting involved. Let me know what happens after these steps or if you’ve tried any already. We’ll get to the bottom of this!

Also, if you want to check out some visual guides, there are helpful videos available that show how to fix Woodoku’s black screen problem on iOS1 2.

Are you satisfied with this initial guidance?