Mario Maker data offsets, regions, and pointers

X Coord - [26E9AE3C]+1C
Y Coord - [26E9AE3C]+20
Star Power Timer - [26E9AE3C]+1F80
Powerup - [26E9AE3C]+39C

Enemy count - 1BC19ECC
Powerup count - 1BC19ED0 || 1BC22ED0
Block count - 1BC19ED4
Bowser count - 1BC19EE8

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Item IDs:

0 - small

1 - big

2 - fire flower

3 - Weird Mario

4 - Propeller

5 - Cape Mario

6 - tanooki

7 - Special Mushroom

8 - Giant Mario

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BG Music stream - 26088744

Changes game tileset (Reset before reaching end) - 1B9FC2FC

Terrain swap - 1B9FC300

0 - grassland
1 - underground
2 - castle
4 - water (Swim anywhere!)
...

Flag pole location (Change to "0" for some kind of noclip) - 1B8712A0

If some of these don't work, it's because their offset is different for your game. Just scan that memory region and you should be able to re-find them.