Heres what works for me--5200 pacman's monsters are the most vicious ghosts out of all pacman ports(in my opinion) so i think of it as survival pac man lol. The goal is to survive until the 7th key. The 5th key, the 7th key and beyond the ghost never turn back to normal once you eat a power pill. You can run your score till it turns over and beyond. From cherry up to 5th key Dont worry about racking up points,eating monsters or eating fruit or keys....Just get past each screen clearing all the dots the best you can while surviving the onslaught of the 5200 ghosts. Really no set pattern but i start off all screens clearing the bottom row from left to right to the power pill. I also use the inner and upper corridors around the ghost house for escape.Dont be distracted by fruit and eating ghost for racking up points and you will make it eventually to that 7th key. It took me about 25 games and about 9 hrs to make it lol.