Mega Man Zero/ZX Legacy Collection has a number of tweaks over the original games, including some quality of life features. One example is Casual Scenario Mode, which offers the same core gameplay experience, but powers up your character, gives you extra lives, and reduces the penalty of spikes and pits from instant death to taking damage instead. Wondering why Capcom is included this mode? Series producer Kazuhiro Tsuchiya explained in an interview with Gamer.
“As you said, it’s been 18 years since the release of Zero 1, and even primary schoolers back then are now adults. There are some people who might want to ‘just go fight that boss’ or ‘see classic scenes’, so this is a way we’re providing for those users. Also, the Zero and ZX series are popular for its solid story, and so Casual Scenario Mode is also for those players.”