SA2B Metal Harbor Mission 1 - Get to the Goal Ring - No Upgrades (A-Rank)
Part of my "No Upgrades" run. Meeting the point requirement for this mission is surprisingly more difficult than you'd think at first glance -- without the light speed shoes, you can't rack up an easy 1-2K from rings alone. It has to be made up elsewhere, then you have to beat the clock. Realising grinding on rails gives a pretty big bonus gave me the drive I needed to complete this.