This is one of my levels in Super Mario Maker. It has a lot of spikes, and saws. It also has one of my less forgiving spike runs, as the time to get to each star is really tight, and there are also a few jumps that are so hard to do. At the end of the spike run, there is another checkpoint, but if you get it and die, you have to redo the whole spike run once again. And after the spike run, there is a boss fight. If you manage to keep the mushroom on it, you can damage boost on the last jump, like I did, but that is not required to beat the level. The jump is possible with small Mario.
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You can find all my other levels here: https://supermariomakerbookmark.nintendo.net/profile/ZPappa7?type=posted