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By the way, playing with one-way portals is actually quite interesting; it gives you an adrenaline rush!:D

The adrenaline rush is only for those who don't read the inscription on the object before entering the teleport and only find out where they ended up after visiting it. It's also interesting to play tank battles, digging games, and counting games – you definitely won't have to delve into the complexities of teleport problems on HL+U templates there. :)