Super Nt is compatible with all Super Nintendo and Super Famicom game cartridges. Unfortunately Super Scope is not compatible on HDTVs - only on CRTs. You can use a CRT and Analogue DAC with your Super Nt for Super Scope support.
Yes, Super Nt supports flashcarts.
Yes, Super Nt has a designated PAL mode accessible in the systems in game menu.
We highly recommend using low latency TV's for the best experience. Make sure to put your TV in "game mode" or turn off all the processing settings (motion modes etc). In terms of specific TV models, we suggest using the LG OLEDC7P.
Yes, make sure it is low latency and in game mode. We suggest using the LG OLEDC7P.
Make sure your game cartridges are squeaky clean. 99.9% of all issues are game cartridge related, usually due to dirty cartridge pins. Clean the cartridge pins carefully with diluted rubbing alcohol and a q-tip. Make sure your cartridge is totally dry and try running it on Super Nt again.