Regarding the "other way" to have those tile fall, if the idea is that you go down from the starting room, doesn't seem a problem. The only problem seems how to get back after drinking the potion. Possibly, if you manage to exit the two gates where the green potion is, you could have those floor fall at the end, while exiting that room.
Let's follow the possible paths for going down. There is the one I shown, that drives you directly to the first potion. Or there is going down directly from the starting room (possibly doing some other things before).
If you plan to ever go back in the room on the left of the starting one, then you have to kill the guard on the raise button, since by default he isn't pressing it, so if you don't do that, you can't enter coming from the left. By the way, if you plan on using his dead body in other rooms, you can't, because if you drag him on the left, he will also fall down one level, and the programs seems to have him disappear without pressing any buttons.
Once you entered that room (coming from the starting one) you have three way out:
1) the way you came
2) going down by the loose floor
3) from the left, past the guard
if you follow the 3) then you get stuck. True, you can exit from the loose floor on the right side of the gate. But doing so, if you haven't drunk the potion yet, the loose floor will erase the potion. So I would exclude that path.
If you go for the second path, I would then follow my previous solution
but let's say you can't.
Both going 1 or 2, you have no way to avoid pressing a drop button that closes
- the gate you used to enter the room on the left of the starting one
- the two gates where the green potion is
In fact, if you choose to go back where you started, there is a drop button you have to press in order to climb up.
If you choose to go down and drink the potion (a thing that you have to do sooner or later, even if going for the path 1) then you find yourself with a drop button on the left and one on the right, both closing the same gates, and you have to climb up one way or the other.
Conclusions: it seems unavoidable that:
A) the room on the left of the starting one remains accessible only from the left (if you killed the guard)
B) you have to find raise buttons for the two gates where the potion was, since they get closed.
If that holds, the loose floor on the right of the gate in this very central rooms seems useless. True, you can use it to go down passing through the gate. If you are arriving here after getting the potion (let's assume you already drinked the other one too) you can't simply go down otherwise you will again find yourself with a drop button both on the left and on the right.
You could think you could use the hole to go down, trying to land on the right (or at least grabbing the floor avoiding the drop button): I have tried it, you can't. If you are arriving from the only place where it seems possible to open that gate, which is to say, the room on the left of the starting one, when you arrive here, the gate is already almost close, so you can't jump right starting from the left of the gate. And if you pass the gate, it seems there is no way to avoid falling on a drop button: I tried jumping, walking, going down and also having the kid grab the upper floor till he looses the grab, still, he doesn't seem able to grab the down floor without pressing a drop button.
Going back to fact (B), it seems there is only one raise button for the left gate and two of them for the right one. This is the only thing that leaves me dubious at the moment, until you say where is my reasoning wrong, I mean
The button that raises the left gate is in between of them. If so, assuming you already drank the potion, which means you closed the gates, you have to make the floor fall onto it. Which means, you had to go down not "my way" but directly under the starting room, leaving "alive" the loose floor in the room on the left of the starting one; you had to go back in the latter and have this floor fall. If so, you can go down with the floor, jump over the drop buttons, and try some other acrobacy, which is where I was originally, but I found them all too slow. If we are going through this, we can assume the left gate stays open forever, from now on. (And, we haven't used the hole for now).
There are two raise buttons for the right gate. Past it, on the right, there is a loose floor that falls down onto a raise button. But to make it fall, you should have already passed the gate. Or, you could have it fall while going down directly under the starting room. But then, you wouldn't have drink the upper potion yet, so you would press a drop button after the raising one, so it would be completely useless to have this loose floor drop before. Conclusion: it seems there isn't any use for this button and this loose floor. Maybe here is something I am missing, but having said what I said, it seems there aren't any "holes in the plot" too
The second raise button is just on the left of the upper gate near the hole. This is the acrobacy I described before, you can't manage to make it in time. The other acrobacy I tried is open the upper gate by pressing the button in the room on the left of the starting one, then go through the chompers and all the way under until you arrive to the gate and pass it and you find yourself near the hole; but as I said, I always landed on a drop button even with this path.
Am I missing something?
Or is something working in a different way then you intended (for example, the guard should open the door without having to kill him before)?
Here's a hint for that solution: regarding that gate to the right of the raise button, where you seemingly would get trapped: what if the loose floor there is not the problem, but in fact a great help?
I'm even no more sure we are speaking of the same hole
Are we speaking about the loose floor in the roome with the upper potion, where there are the gates and two drop buttons? If so, as I said before, It doesn't seem to be a way to go down through that hole.
And about "knocking down that one tile from below": I was referring to a different approach for getting that tile to fall... Think back to how you got the bottom-most green potion... And think about the duration of the feather effect...
Now are we speaking about the two loose floors, one of which I referred to as "don't worry"?
I see there could be a trick: if you have the right tile drop down from below, then you can have also the left one drop without having to pass above it. I just discovered a trick where if you try a jump up-left while holding shift, the kid grab the floor, which then falls. But:
- Doesn't seem important (as I said, you could even run on it while exiting from the room with the two gates where the upper potion was)
- the problem of exiting from the room with the drop buttons, the gates, (and where the upper potion was) remains untouched. That's my main problem, it seems.