Hello! Sorry to hear that the Test'em All app is crashing on startup on your iPhone running iOS 18.5. Let's work through this together to get it running smoothly again.

First, could you tell me if you've already tried any steps like restarting your iPhone or reinstalling the app? Also, did the crashes start happening after a recent update of the app or your iOS?

In the meantime, here’s a simple step-by-step approach we can try:

1. Force Close and Restart the App:
Sometimes apps crash because they didn’t close properly last time. Swipe up from the bottom of your screen and pause in the middle (or double-click the Home button if your iPhone has one) to open the app switcher. Then, swipe the Test'em All app off the screen to close it completely. Try opening it again.

2. Restart Your iPhone:
Hold the side button and either volume button until you see the slider. Slide to power off, wait 30 seconds, then turn your iPhone back on.

3. Update the App:
Open the App Store, tap on your profile icon at the top right, then scroll to see if there’s an update available for Test'em All. Updating can fix bugs that cause crashes.

4. Check for iOS Updates:
Sometimes bugs fixed by Apple can affect app stability. Go to Settings > General > Software Update and see if an update is available.

5. Reinstall the App:
Press and hold the app icon, select "Remove App," then choose "Delete App." After that, reopen the App Store and reinstall Test'em All. This can clear corrupted files.

6. Free Up Device Storage:
If your device storage is nearly full, apps can crash or misbehave. Check Settings > General > iPhone Storage to see if you need to free up space.

If after these steps the app still crashes immediately on startup, it could also be related to specific account issues or app permissions. Do you notice if the crash happens right after logging in or before?

Let me know what you’ve tried or observed, and we can go from there!

Are you satisfied with trying these steps, or would you like me to guide you through them in more detail?