Why Gaiden is canon (no question marks or grammatical errors here)

[News Bot]

Actually it was a small independent dev team in England called M4 Limited. Virgin just did publishing in the UK as per earlier Capcom contracts for the GBC title. Also check the credits to see who had input on the scenario and planning for the game:

Ah, correction. I knew it was a more specific team, but Virgin was the only thing that crossed my mind.

[aris13]

Gaiden isn't canon. I'm going to play the ending card one more time.

[Rakkoon]

Come on people, it's just for fun. It's obvious. People are giving this too much thought. Why all the attention? I don't even care about Gaiden or any of the Survivor titles. Playing each of those 'games' once has been enough. I have never wanted to play them again, and I've always thought they were silly, and just for fun.

[Darkmoon]

Because if they're not canon they need not be paid any attention.

[REmaster]

The start of Gaiden reminds me of contra or the original G.I. joe game on nintendo with it's fast paced little theme song.