The opening was very slow and waiting for the Zs to move on so B could try another 'B toss' was boring. After that - simple Z avoiding all the way to end....
Btw....Look at this... Spoiler That stairs possibilities this trick and shortcut https://photos.app.goo.gl/ffWYAn8V5vbmk9MT7
Hi and welcome to the forum. Slow going at the start and standard Zapper dodge that follows. Saw the stair shortcut @delator77 showed you, but did not use it.