Tip: Remaking levels from other Mario games is strongly discouraged, especially popular ones (World 1-1 from SMB or SMB3, for example), as their over-presence in Mario games, official or not, often makes them uninteresting to play.
1) You had a STA $7DFC|!addr, which would not work in a non-SA1 ROM. The correct command is STA $1DFC|!addr;
2) Added a define to customize the number of coins earned.
3) Following 2), I think this block should be named as a "Multiple Coin" instead of "x2 coin".
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