The game has protection checks relating to the speed the game runs at. If you run the game at 60hz it will crash when you die on level 4.
If you run the game at the correct hz, as current MAME does, and FBN does, the protection passes and the game does not crash.
Thank you, @haze for the explanation
![smiley :smilie:](https://neo-source.com/Smileys/default/smiley.gif)
regarding @dink statement: "In fbneo you can set it to "force 60hz" refresh rate option and play it more smoothly, it will still use 57.42 for its internal calculations to prevent crash in level 4. (in theory, I haven't tested this)"
@dink, I put the option you pointed out to me:
![](https://i.postimg.cc/V6NrzKLw/f1.jpg)
And the game runs smoothly and the black screen error does not appear on level 4. I have let myself get lost about 5 times and the error has not appeared. The game is fully playable at 60hz with that option enabled and, of course, can be finished without problems:
![](https://i.postimg.cc/hj3s9CC4/f2.jpg)
And regarding @barbudreadmon comment: "Note that the game will run faster by doing this". The truth is that I don't notice such a noticeable increase in speed, it seems normal to me. In sound either, maybe it's because I have a bad ear
![grin :biggrin:](https://neo-source.com/Smileys/default/grin.gif)
, but it doesn't bother me.
In fact, I play pretty much the same as before after they upgraded to 57.42 Hz with the "force 60hz" option enabled.
Thanks so much to all 3 of you, you guys are great.
![;p ;p](https://neo-source.com/Smileys/default/wink.gif)