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View topic - Prince of Persia for SMS level editor

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  • Joined: 10 Oct 2019
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Prince of Persia for SMS level editor
Post Posted: Thu Oct 17, 2019 5:19 pm
I'm creating a level editor of Prince of Persia for the Master System.

An alpha version (incomplete, with bugs) is already available for download:
www.popot.org/level_editors.php?editor=lemsop

There is a forum thread at Princed where I discuss three obstacles I'm trying to tackle (2nd post, about byte meanings/offsets).
http://forum.princed.org/viewtopic.php?f=63&t=4389

This port has various hidden elements, some inside walls and some (potions) invisible to the player but still reachable. Related thread:
http://forum.princed.org/viewtopic.php?f=63&t=3400
The port also has broken room links, which means sometimes to prince can go certain places but not (really) back. See my 2nd post in aforementioned thread, plus you can use the editor to find these broken room links.
lemsop-0.7a.png (32.37 KB)
lemsop 0.7a
lemsop-0.7a.png

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  • Joined: 10 Oct 2019
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Post Posted: Thu Oct 17, 2019 5:35 pm
One cool thing about the SMS port of PoP is that it can properly process multiple princes! :)
No joke.
Several of the custom element numbers will place princes.
(In fact, custom elements will add all kinds of crazy things in the level, try it out...)
When multiple princes are in a room, they both obey the game's 'rules'.
Example: if one falls into a hole to a lower floor while the other has no hole, the latter won't move down.
If any of the princes exits the room, the view (and prince) changes to that room.
All this can theoretically be used by modders to create puzzles.
custom.png (15.88 KB)
custom elements
custom.png

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Post Posted: Thu Oct 17, 2019 10:18 pm
I remember back when I made the maps at http://www.smspower.org/Maps/PrinceOfPersia-SMS that some levels had areas that I think are unreachable without hacking, with weird behaviour (no multiple princes though). There’s also the “inaccessible area” in level 3 - is there anything reachable there?

As you noticed on the linked forum posts, I’m a huge fan of the game (I never really played the other versions...) and I love hacking them Master System so I guess I’ll probably have a go at figuring out some of those questions you posed. The hidden potions are already very interesting - although probably just bugs much of the time :)
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Post Posted: Thu Oct 17, 2019 10:59 pm
Your maps were useful to me as a reference when I first started working on the editor.

Maxim wrote
There’s also the “inaccessible area” in level 3 - is there anything reachable there?


The inaccessible area contains nothing (not even empty rooms), because the rooms below it have their upper room links set to 0xFF. You can verify this level layout using the editor. First, go to level 3 (2x keyboard "+" or 2x left-mouse the double-arrows button top right). Then, go to the room links screen (keyboard "r" or left-mouse the "R" button). I always add 1 to room numbers, so in the ROM they start at 0. Also, the four unused rooms in the side pane are empty.
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Post Posted: Fri Oct 18, 2019 8:33 am
Well, part of the art of making video game maps is sometimes having to adapt to the game’s illogical connections between areas...
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