If anyone is making Mario Maker levels, and making them on the harder side of platforming, dont forget to add checkpoints in, or dont use clear conditions to add artificial difficulty. I played a level last night called 'Mario buys a toilet', (I will get the level code later for anyone who wants to try it).
Clear condition is collect all 70 coins. First section involved spin jumping across the screen, on top of a sideways thwomp that has a parachute halfway across the screen so the speed changes, while avoiding spineys shooting spikes, podoboos coming from the lava, piranha plants with wings and collecting a 10 coin.
You get past that section, and get a yoshi that instantly you lose, as you have to do a yoshi jump dismount to reach a platform above. Land that and you are greeted with 4 stacked hammer bros, armed with just a shellmet on the ground to kick at them and then stop when it bounces back towards you (miss this bounce and the shellmet flies off screen and you have to restart the level).
Beat the hammer bros and you are rewarded with a mushroom, and get to keep the shellmet as well... which you need for the next section.
You run under some thwomps, then have to spin jump back across the top of them, avoiding saws and more spiney spikes flying towards you, to collect a 10 coin, then spin jump back across the thwomps, again avoiding the saws, to the last thwomp which moves sideways. Travel along that thwomp, and do a big spin jump at the end to get to the next section.
At this point you are given another shellmet. You run and jump across a saw, and bounce a thwomp off of your head. Then run and jump across another 2 saws onto a spring that is on a spike floor, bounce to another spring and then to solid ground.
Kick the shellmet you are holding up to an on off switch, which reveals the blocks needed to get to the next section. 2 conveyers with saws that are 2 forced hits. So if you didnt do that whole first part with no damage at all you cant get through (which I havent).
Its a great level, really hard but really fun, and the enemies are consistent as well for the first part, so you can build a rhythm. But for the love of god it needs a checkpoint.
Unfortunately... any level that has a clear condition cannot have a checkpoint as a rule, as there will be coins/whatever before that checkpoint that you couldnt get.