Coz I dont know other platforms i can play the game is too old.

In my opinion, NES emulator are not forbidden, but some of them are more used by precision, better performance than others. If u want names of emulators that wanna use: Bizhawk, Mesen, JNes, Fceux (newer versions). Of course, a restriction of emulators go more for smartphone that prolly are not permitted in most/almost all leaderboards. Just using emulators in PC, notebook and that's it. The same happens for the rest of the ports and emulators (Arcade, GBC, Amiga, C64, etc).

Emulators are allowed. FCEUX is a good one to use. A lot of people use Bizhawk as well. Mesen has recently been banned by a lot of communities so I wouldn't use that one. Smartphone emulators are banned. Best of luck to you!

Thank u guys and Im very sorry for late reply. Cheers!