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Falling into walls in original PoP

Posted: February 1st, 2020, 9:32 pm
by David
atrueprincefanfrom18 sent me this in a PM:
atrueprincefanfrom18 wrote: February 1st, 2020, 8:21 pm Hello, I was playing the original PoP1 Level 2 and I did something odd and this thing happened... Why would it had happened? Please will you check the attached p1r files and let me know?
ohshit.p1r
(3.11 KiB) Downloaded 208 times
This is a glitch in the game, and it's a glitch which I haven't seen yet.
Nice find!

I could reproduce it in the original (DOS) PoP as well, so this glitch is not specific to SDLPoP.
(SDLPoP is based on the DOS game, so it "inherited" the bug.)

To reproduce it in the DOS version:
If I simply climb up to that ledge, the prince will already be aligned as needed for this glitch.
Although in the DOS version, the prince will end up in a different room.

atrueprincefanfrom18 wrote: February 1st, 2020, 8:51 pm Yes, sure, please put it for others to view, have absolutely no problems.
I don't exactly know where it would properly fit in, that's why I sent you a private message.
But the main question still remains... I played again and some elements changed. Where is the room where the kid lands? At what other places can this happen and why?
If you press C in cheat mode then you'll see that this strange room is room 128 in SDLPoP and room -128 in DOS PoP.
This is an invalid room number, which means the game will read some out-of-range memory area as if it was level data.
That area doesn't contain any valid level data, so its contents will appear as a garbled room.

A similar glitch can happen if the prince dies at a place where there is a wall immediately on his right, and you revive him with R (in cheat mode).
The prince will fall into the wall, and he'll end up in a glitched room like in your recording.
Here is an example: https://youtu.be/-oEJBESyTVs?t=121

Re: Falling into the wall on level 2

Posted: June 11th, 2020, 8:00 am
by atrueprincefanfrom18
More in original game of Level 7:

into_wall_level_7.p1r
(3.23 KiB) Downloaded 209 times

And this is a odd death, I don't know how this happened:

odd_death_level_7.p1r
(3.17 KiB) Downloaded 139 times

Re: Falling into the wall on level 2

Posted: June 13th, 2020, 6:33 pm
by David
I think the same glitch happens here at 1:57.

Re: Falling into the wall on level 2

Posted: June 14th, 2020, 3:35 pm
by VelCheran
Is it the same bug as this video, maybe ?
https://www.twitch.tv/karlgamer/clip/Co ... cingBanana

Re: Falling into the wall on level 2

Posted: June 14th, 2020, 5:27 pm
by atrueprincefanfrom18
VelCheran wrote: June 14th, 2020, 3:35 pm Is it the same bug as this video, maybe ?
https://www.twitch.tv/karlgamer/clip/Co ... cingBanana
Yes, it's a trick discovered already. Trick 95.

It's also possible on left side, but you need to get proper distance to replicate the same:

This one is where you can go through the tile:

thru_tile_left.p1r
(3.41 KiB) Downloaded 177 times

This one is a fall, so you land with a loss of one HP. But you can go through :)

thru_tile_fall.p1r
(3.48 KiB) Downloaded 184 times

I have used this trick in some of my mods previously. Maybe you can try some! ;)

Level 10 glitch

Posted: July 15th, 2020, 11:08 pm
by dronno
hi all,

I was not able to replicate this, and I don't know how well-known this is, but in Level 10 if I make a standing jump from here
L10.png
I end up here:
L10b.png
EDIT: It can be replicated as follows. From the edge of the short platform on the right, do 1 standing jump, 4 quiet steps, turn right, do the "climb up" jump, turn left, standing jump.

Re: Level 10 glitch

Posted: July 16th, 2020, 5:59 am
by yourantumayel69
Please see the picture below: 👇
20200716_105736.png

Re: Level 10 glitch

Posted: July 16th, 2020, 9:24 am
by David
dronno wrote: July 15th, 2020, 11:08 pm I was not able to replicate this, and I don't know how well-known this is, but in Level 10 if I make a standing jump from here
[...]
I end up here:
[...]

EDIT: It can be replicated as follows. From the edge of the short platform on the right, do 1 standing jump, 4 quiet steps, turn right, do the "climb up" jump, turn left, standing jump.
Nice find!

I tried what you wrote, but in my case the prince fell into an empty room and then landed in an actual room of the level.
And somehow the purple guard in that last room became orange. Weird.

Here is a video about it:
level_10_into_wall.zip
(76.84 KiB) Downloaded 198 times
By the way, a similar glitch was found on level 2: viewtopic.php?p=27589#p27589

Re: Level 10 glitch

Posted: July 16th, 2020, 11:39 am
by Norbert
David wrote: July 16th, 2020, 9:24 amHere is a video about it: [...]
David's video:

Re: Level 10 glitch

Posted: July 16th, 2020, 7:47 pm
by dronno
David wrote: July 16th, 2020, 9:24 am
I tried what you wrote, but in my case the prince fell into an empty room and then landed in an actual room of the level.
And somehow the purple guard in that last room became orange. Weird.

Interesting!

Btw I notice that in David's attachment the last guard indeed became orange, but Norbert's video it did not

Re: Level 10 glitch

Posted: July 16th, 2020, 7:58 pm
by atrueprincefanfrom18
Cool! I guess it's time to try to go through all walls of original PoP! :P

Re: Level 10 glitch

Posted: July 16th, 2020, 7:59 pm
by atrueprincefanfrom18
David wrote: July 16th, 2020, 9:24 am By the way, a similar glitch was found on level 2: viewtopic.php?p=27589#p27589
Would be great if you merge this topic to that one and rename that topic to "Going through walls in original PoP" or something like that.

Re: Level 10 glitch

Posted: July 16th, 2020, 8:09 pm
by atrueprincefanfrom18
I end up here:

screenshot_101.png
screenshot_101.png (3.33 KiB) Viewed 4598 times

And on the console:

Code: Select all

Tried to use frame_tbl_guard[-149], not in 0..40
I was playing on SDLPoP, not DOSBox.

Re: Level 10 glitch

Posted: July 16th, 2020, 9:00 pm
by Norbert
dronno wrote: July 16th, 2020, 7:47 pmBtw I notice that in David's attachment the last guard indeed became orange, but Norbert's video it did not
Err. Then David must have replaced his attachment... I guess.

Re: Level 10 glitch

Posted: July 16th, 2020, 9:09 pm
by atrueprincefanfrom18
Norbert wrote: July 16th, 2020, 9:00 pm
dronno wrote: July 16th, 2020, 7:47 pmBtw I notice that in David's attachment the last guard indeed became orange, but Norbert's video it did not
Err. Then David must have replaced his attachment... I guess.
I downloaded it now and didn't see any orange guard... Weird.

Wait!
In VLC Media Player it's Orange and in normal Videos Player it's Purple. I am using Ubuntu and I don't know the name for default Videos Player. Something is very weird...

David, how did you create the video?