Halo Anniversary Bonus Credits - A few questions

Hey everyone - I just found out that you can get a 100k bonus credits by unlocking each terminal in Halo Anniversary and using some codes/etc in Halo Waypoint.

Do these credits improve your overall level or are they just bonus credits to buy various things?
Additionally do they count against a daily cap?

I’m trying to decide if it’s a better use of my time to grind 100k credits in Reach or to play Anniversary to get them.

Thanks! :slight_smile: