posted by wap, platform: Nexus 7
Most normal NES cartridges could not be used; rather, the PlayChoice used special expansion cards containing NES games along with an extra 8KB ROM to display hints.
https://en.m.wikipedia.org/wiki/PlayChoice-10
The following is a list of all 54 games that were made available on various PlayChoice-10 machines.
lz说的难度是关卡有变化还是楼上说的敌兵血量和数量的区别