Mega Man 2 is a platforming game for the Nintendo Entertainment System.

Following the gameplay of the first Mega Man game, Mega Man 2 has new features, like Robot Master stages increased from 6 to 8, E-cans that replenishes health to 100%, and support items/platforms 1, 2, and 3.

After his defeat, Dr. Wily created his own Robot Masters and continued his desires for world domination. Mega Man is the only one who can stop the evil scientist once again. But before he could reach him, he needs to defeat Dr. Wily's Robot Masters and obtain new powers from them.

Rockman No Constancy is a complete romhack of Rockman 2.

Modifications include completely new soundtrack, new graphics, altered bosses/weapons, and completely new level layouts.

v1.0 (21 October 2007) Initial release:

NORMAL mode can be satisfactorily cleared even without a save states.

HARD mode specifications:
-Attack power/Half Defense power, or 3/4 (Damage fraction up)
-Life recovery amount 10 → 8; Life recovery small amount 2 → 1
-Shocked only during unbeatable time knockback after hit (110 frames to 32 frames)
-Change Rockman's body color and title color
-Heatman's weapon has improved energy efficiency to 1 due to operational reasons
----

UPDATE: v1.2 (2018/04/13)
-Mainly cosmetic changes
-Player sprite designed to look like Rockman X
-Got weapon and ending image of Rockman changed
-Got weapon image of Roll changed
----

UPDATE: v1.3 (2019/01/21)
-Hard mode addition
-Adjustment of special weapon versus enemy damage
-Partial special weapon pallet change
-Expand grace time for blue charge shot (increase in power) of Proto Charge
-Change the body judgment of the Rumbling Bomb so that the ball trajectory moves slightly forward
-Extend Flashman's Time Stopper usage interval
-Increase Woodman's weak point damage from 6 to 8
-Changing the Rumbling Bomb to touch the Mecha Dragon's scaffold
-Normal version only Decrease the judgment of the Wily Machine bullet accordingly
-Only the normal version relaxed the high difficulty part of the stage changed

Hard mode specification
-Body color change of Rockman
-Reduce invincible time in half
-Double the enemy's overall durability by a factor of twice (special weapons versus enemy only available)
-Excluding some of the attack power of the boss 1.5-fold rise
-Life restoration small recovery amount 2 → 1 life; weapon recovery large recovery amount 10 → 8
-Increase the initial remaining lives to 5

No-Intro Name: Rockman 2 - Dr. Wily no Nazo (Japan)
(No-Intro version 20130731-235630)
File MD5: 055FB8DC626FB1FBADC0A193010A3E3F
File SHA-1: FB51875D1FF4B0DEEE97E967E6434FF514F3C2F2
File CRC32: 30B91650
ROM MD5: 770D55A19AE91DCAA9560D6AA7321737
ROM SHA-1: 3E9DC769E1B63E73834786EC7FE9EDE7E706C72F
ROM CRC32: 6150517C