tokumaru wrote:
Yeah, that would be a good use for such blocks, but I can't think of any games that did this with walls.
N [+] has one-way platforms, 4-orientable, pixel-placeable. (Y'know, that flash ninja game that got ported to DS, etc.). There are a myriad of maps for it; it is used both as a one-way-door, as a danger-zone trap(ninjas get in, can't get out), as a simple wall (doubled-up to make a full wall) if aesthetically desired or just because the block-grid doesn't provide enough...
Adventures of Lolo has its arrow tiles, which are all-but-aesthetically one-way-walls.
If I recall correctly,
Super Mario World's land-shapes can function this way, but are not used as one-way-walls in the base game ever.
One-way [or trap, for down]doors are a far-more common case, though. (A subtype is a turnstile.) Probably next-most-common are insurmountable conveyor belts/zones.
Other common gimmicks in this vein are blocks that become solid when moved through (e.g. Chip's Challenge), doors shutting behind you...
tepples wrote:
Yoshi's Island has those pinball flipper things that allow only downward movement
They are oriented horizontally
fairly often too. Not sure if any are up-only; the lack of a jump-down command makes a simple pass-through platform fill that niche.
La-Mulana has one-way doors a-plenty, along with trapdoors you cannot jump back up through. Not sure if its inspiration
Maze of Galious does.
Zelda 2 and
Super Metroid (onward) have crumble-blocks, which standing on destroys, but cannot be destroyed from beneath.
Super Metroid has a few other ways to do one-way, doors being obvious; speed blocks with running room only on one side (with regeneration), or closing gates...
Link's Awakening has one-way doors (body-wall spinners).
Wario: Master of Disguise has currents that are too strong for non-specialized form to counteract.
For that matter, so does
Super Mario Brothers 3. (Donut Lifts may count under 'crumble blocks' down-only variety;)
SMB1 on have invisible coin blocks.
For that matter, SMB1/2 has blocks you cannot pass left through; it just triggers a screen-width later Milon's Secret Castle has trapdoors.
Though not quite what you meant on one-way walls,
Lemmings does have walls you can dig through in only one direction.
I feel like I'm missing a (recent, indie?) platformer game that did this, with arrows pointing in a direction you could not move, for all four directions...