Currently osu!std RC says:
1. EZ reduces circle size, and hence increases the shift of stack;
2. EZ increases stack leniency, causing some patterns to get stacked which were not with None;
3. HR flips the playfield but does not change the direction of auto stack.
It is very easy to create working examples for all of them, so I just skip the screenshot.
I think it can be reworded so as to be more specific about the effect of mods.
However it is possible for a stack which is not off-screen in None to go beyond the playfield with EZ or HR, due to the following three reasons:osu! ranking criteria Overall-General-Rules wrote:
Hit objects must never be off-screen in 4:3 aspect ratios. Hit objects that are even partially off-screen can create reading difficulties. Test play your beatmap to confirm this.
1. EZ reduces circle size, and hence increases the shift of stack;
2. EZ increases stack leniency, causing some patterns to get stacked which were not with None;
3. HR flips the playfield but does not change the direction of auto stack.
It is very easy to create working examples for all of them, so I just skip the screenshot.
I think it can be reworded so as to be more specific about the effect of mods.
Hit objects must never be off-screen in 4:3 aspect ratios. This includes off-screens caused by game modifiers Easy and Hardrock. Hit objects that are even partially off-screen can create reading difficulties. Test play your beatmap with None, Easy and Hardrock to confirm this.