One-Way Nether Portals

Nether portals built with or containing crying obsidian do work, but only half way. They don’t generate an exit portal, and don’t link up to any pre-existing portals. They just plop you at the corresponding coordinates (or the nearest solid block) in the other dimension with no regard for your way back. To distinguish them from normal portals (aside from the crying obsidian in the frame) the actual portal blocks (the swirly purple bit) is a bit crackly. I think these one-way portals have great potential for things like challenge runs, minigames, puzzle maps, etc. They might also be useful in farms, but I’m not technically-minded enough to know for sure. It’s