I've seen a few things lately that cross the line between being difficult and being stupid/unintuitive. I am going to clearly state them here for all you mappers and modders and otherBAT and MAT to read, along with the reasoning.
The BAT has already reached consensus that these things are not rankable, so if you have them currently in your map, you would do well to pay attention.
1. Short-term bpm changes in the lowest difficulty map of a set. By this, I mean bpm changes to half or double speed for a single slider that is not directly preceding a break and/or has no reason to occur in that part of the map. This is not allowed because it is simply too difficult for new players to pick up on it, and by the time they do figure out what just happened, it's reverted back to normal already. I'm sure you can understand how frustrating this would be.
2. Back to back, identical-looking sliders with different bpms. This is because players of a sufficient skill should be able to read your map the first time, rather than learn it by guess-and-check. The entire purpose behind things such as spacing, combo breaks, and other very necessary parts of a map is so that the player can know what to expect, and by the same reasoning that you shouldn't randomly double the time between two notes within a combo while the spacing remains constant, you should also
not randomly double the amount of time a slider takes to complete next to another slider of the same length.
Edited because there is a certain clause people keep forgetting to read.
The BAT has already reached consensus that these things are not rankable, so if you have them currently in your map, you would do well to pay attention.
1. Short-term bpm changes in the lowest difficulty map of a set. By this, I mean bpm changes to half or double speed for a single slider that is not directly preceding a break and/or has no reason to occur in that part of the map. This is not allowed because it is simply too difficult for new players to pick up on it, and by the time they do figure out what just happened, it's reverted back to normal already. I'm sure you can understand how frustrating this would be.
2. Back to back, identical-looking sliders with different bpms. This is because players of a sufficient skill should be able to read your map the first time, rather than learn it by guess-and-check. The entire purpose behind things such as spacing, combo breaks, and other very necessary parts of a map is so that the player can know what to expect, and by the same reasoning that you shouldn't randomly double the time between two notes within a combo while the spacing remains constant, you should also
not randomly double the amount of time a slider takes to complete next to another slider of the same length.
Edited because there is a certain clause people keep forgetting to read.
Believe it or not, I've actually narrowed these definitions down quite sharply, and I'm not sure that you noticed the qualifications (which I believe have also covered every single counter-example thus far).