Curlyriff has said it correctly (thanks for that!). I hereby add the following official information as additional details:
What’s included in the alpha and how will it work?
- Phase 1: Modular building and Paths
- Phase 2: Adds Coaster Building and Landscape editing
- Phase 3: Adds Community Functionality and Blueprints
You’ll notice that the Coaster Building is placed in Phase 2. That’s because it is not yet finished to our satisfaction – there are several areas we will improve. However, the hands-on feedback from experienced players who have used it to date has been good, and we do realise you’ll want a coaster builder from the start of your Planet Coaster experience, so we added a cheat code for you to unlock the current state of the coaster building tools in the first alpha build!
For your ‘sneak peek’ at where we are with coaster building, simply follow these instructions:
To access coaster building, open a map and select the ‘Rides’, ‘Scenery’ or ‘Buildings’ tab, then select the ‘Search’ option (a magnifying glass) and enter the code ‘underconstruction’ (all one word in lower case) to enable the coaster construction tab.
Source:
here