This is a hack of the JP version of Megaman 2 called Rockman 2 - Dr. Wily no Nazo. It shortens levels so that bosses are encountered almost immediately. It also seems to change some boss behavior.
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2011 8/7
ver.1.0?Ƃ??Ċ???
2012 8/9
ver.1.1?@???y???C??
Rockman 2 - Dr. Wily no Nazo (J) [!].nes - GOODNES 3.14
CRC32: 30B91650
MD5: 055FB8DC626FB1FBADC0A193010A3E3F
SHA-1: FB51875D1FF4B0DEEE97E967E6434FF514F3C2F2
SHA-256: DEB88223311ACA8CA566B99D4063CA29D389D939FEE455F83AFAEC97C6F0A5D1