It's best to start Crazy Castle with a few simple rides. Players should create a few gentle rides, several thrill rides, and one roller coaster ; then add two stalls and a restroom starting by May. Then comes hiring time : one or two handymen and two mechanics will do the trick. It's usually a good idea to limit their patrol areas, but it's important to remember to add the new rides as time goes by. This start can (and should) be accomplished without loaning any money.
Just before opening the park, players must make sure to get rid of the path around the castle and other pathways not readily needed at the moment. This is because the guests are seriously likely to get lost in the park and they usually do it on its unused pathways anyway. These pathways might be needed later on, so deleting only one path tile is really what it takes. The path in the turret east to the park's entrance can be demolished totally, there's no room in it for rides.
When it comes to research, an important element that will be needed (and which was absent of RCT1) is the Cash Machine, that allows players to refill their wallet when they hit low funds. If they're out of cash and there's none in the park, they'll leave. Plus, as clever players know, guests come back to the park, not time. It's therefore a solid option to tick in the player's to-do-list if they plan to make money.
Then comes another session of job-dating : players have to make sure that (it's an important rule of thumb to keep in mind at all times in RCT2) their whole "used surface" (the surface filled with guests & rides) is covered by staff with small patrol areas set. If covering their park's "used space" requires 12 handymen, 6 mechanics, 14 security guards & 4 entertainers, then "let it be done" : players have to hire and have the right amount of staff, if not more.
If by then some flat rides fail to attract guests in, then players should decrease their admission fee to $0.80 or lower. At this price, they never lose popularity. Another option for cash-driven players is to renew these rides by replacing them with brand new ones. Renewing a ride is an available legit option done with only a couple clicks in OpenRCT2, but in vanilla RCT2, it's demolition then reconstruction.
As important as they were in RCT1, if not more ; Advertisement campaigns will in most cases do the difference between success and fail in this scenario.
At this point, only player-made mistakes will prevent them from reaching the scenario's goal.