RollerCoaster Tycoon/Thunder Rock

Thunder Rock is basically one giant boulder that rests in the middle of an arid desert with a single chairlift to help make the climb easier. Despite the ample amount of time you have to get 900 guests, the real issue is space. Building rides at at a high, uneven area will be challenging, especially since some rides have a height limit, making it difficult to build off the rock. However, you do have a spacious underground to build roller coasters in; that advantage will be key to wining this scenario.

For the chairlift, raise the price to $1.50 and shorten the queue lines to prevent guests from complaining about the wait. Hire two mechanics and have one patrol the bottom station while the other handles the top. Don't forget to expand their patrols when you add more rides. Focus research on more Roller Coasters to get a better variety and then more Thrill Rides to get some Water Rides as they'll be very popular in the heat. Lay down some benches and trash cans and place food and drink both at the top and the bottom of the rock.

For new coasters, there is just enough space to build a launch powered or reverse incline launch roller coaster at the right side of the rock at the bottom. Having a couple of rides at the bottom of the rock will keep guests just as satisfied as having rides scattered around the top and it gives you enough room for at least one more coaster. As for the top, you'll need to have coasters underground as well as above ground to make sure there's enough free room for smaller rides. Although not required, having at least one water ride will satisfy guests when temperatures are high.

For expansion, it's recommended to have one pathway going through the middle of the rock to build more rides and make it easier for guests to get to the other side. If you still need more space, you can try making a pathway at the bottom of the park by going into the rock and going out to the sand where you can place compact rides like the Spiral Slide or the Inverted Swinging Ship. Be careful if guests start to follow the path and fall into the underground or they'll wander around the darkness in confusion. And of course, advertise new rides and offer free drink coupons once in a while to increase attendance.