Cheese the AI with Tengu, spam 7kp and go for 8p+k on every knockdown since AI never techs up and Tengu 8p+k tracks fullscreen, at least that how i remember doing it, but the last time i ever went for that 50 survival wins was in 2006 :/
But the prob is that for each character's costumes, at least for the females, you gotta do the 1.5m points on survival and the 50 wins for a costumes each. I could use tengu to do the trick that unlocks all the costumes at once (I think, by getting 100 stars?) but I'm trying to do it the legit way for Tina at least. Spamming 4PK worked to some extent but then the AI gets all psychic after just 5 wins, lol.