main reason why retroclouds did most likely ask this, is the fact that the ULTIMATE cartridge (https://team-europe.blogspot.com/2020/09/tomy-tutorpyuuta-ultimate-multicart.html) is fully working on the Japanese TUTOR (which i used for developing it). But on the American Tutor you can just play the 32kb games with it...all other games do not start.
I think it's the BASIC, which is included in the American Tutor's...and i most likely map the 8kb/16kb games on the same area...
therefore the ULTIMATE cartridge is so far only for the Japanese Tutor owners interesting...all others will have to use the three carts.