hey i was playing cave story, and this time it was my 3rd time going through the game (the second time to get the good ending and this time to get the spur so i can stand a chance against ballos) and because i am an idiot i forgot to restore curly's memory. i was wondering if there was anyway to go back and fix that. thanks in advance for any help

You probably went too far to restore Curly's memory.
Once you save past the point where you drain the water out of her it's too late.
You're going to have to start a new file. Unless you did drain her.

How much of the Curly sidequest did you do, and is there anything preventing you from going back?

yeah i drained the water, and i looked and i can just go back from where i came. after i beat the undead core and wasn't allowed to enter the prefab building i just rage quit. i was scared to check myself just in case i would end up throwing my 3ds at the wall, which i ended up doing anyway when i fought ballos xD

Ballos is VERY ANNOYING!!! But after many, many, many tries at killing him, I finally got the B*stard. When in his final form and his face "Exposed", just unleash LV.3 Super Missles at him!

I got one question though, does anyone know how to get the last two soundtracks of the Jukebox?

You have to have super-good times in Time Attack to get the last songs (like under 5 mins).

^ Under five minutes...? Are you kidding!? Ah well, it'll be worth the abuse.

Anything Cave Story related is worth it
I'm still trying to beat Ballos myself, never mind with the good times, but I will persevere!

Ballos took me a while. I recommend looking up YouTube walkthroughs for strategies.