1.
I guess he talks about the

on 33.4. In the left of the cane there is a door. So you can go out of the level and then come back later from that door. If you go on the platform near the

it will reappear. If you go near the cane it will turn to a

but it will only do this ONE time. There's what you can do. After the level starts you can use

to "climb" up and reach the cane. It will turn into a blue mushroom. After that you can finish the level, finish the next level, and come back through the door I mentioned. The cane will reappear and this time it won't change, because it has already done this once. If it wasn't for this I would still need it one more time before I unblock it ^.^
2.
Time attack mode is useless here. There is a ranking on the french server, but it's not available here so you can only play it for fun.
3.
If you want points 25.0 is better, because you get many points, plus you also play levels 27 and 28. But I go in 26.0, because I get more letters this way. I value lives more than points

.
4.
THIS is the only picture regarding the levels after the joystick. I don't think it's much harder than the earlier hell levels, but there are few more levels... as you can see the guy has only one life and maybe he didn't survive it. I think Cadomax has not been updated after this screenshot, because there is no info about the red bomb either.
5.
It is actually 6.1, not 6.2 ^.^