Hello everyone,
The "German Efficiency" achievement requires you to build and open 30 flat rides in your initial land of any map. This is how you do it:


Create a sandbox map from the main menu and choose Abandoned Island.



On the settings to the right of the screen choose the following:



Makes sure you keep the Land Extensions option on.

Build a line of Clockwork Carousel at the top of the available land, while making sure you have enough room to connect them into a street.

(Click image to enhance)


You can have two lines of Carousels connect to a single street from both sides (as shown in the picture).

Congratulations, you just won yourself a rare achievement.




This is my first guide on Steam, apologies that it is so simple.
If you need any help with the other achievements don't hesitate to leave a comment.