The big free update to Version 1.6 and our second paid DLC called Booms & Blooms are available now.
Here's a summary of all the changes:

Booms & Blooms DLC (paid):

- added Effects Controller for creating your own fireworks shows, fountain shows, triggering effects from rides, ... (+ modding support for triggering animations!)
- added Tilt Coaster
- added Pivot Coaster
- added Steeplechase
- added Rowboats
- added Heart Breaker
- added Star Flyer
- added switch segment for Mine Train Coaster, Junior Coaster
- added custom image flags
- added fireworks
- added speakers for playing music across the park/custom sound effects
- added new trees and shrubs

Version 1.6 (free):

- added option for automatic day/night cycle
- added mowed grass terrain type
- added deco objects: frames, additional basic shapes, truck, small light that can be stuck to surfaces
- added alternate font styles for 3D text signs
- added German guest names
- added stat boost display to stats tab in employee info window
- added option for changing rotation direction to many flat rides
- added leaf movement animation to trees
- added depth visualization to blueprint builder
- added Italian translation (thanks to Antonio!)
- improved performance in heavily decorated parks by up to 50%
- improved performance of ride lights to cost ~90% less than before
- improved performance when placing blueprints
- improved audio implementation, resolving issues with sounds not playing/being too loud after loading savegame
- improved fire/water/smoke effects by allowing them to be stuck to any surface
- improved number input fields to use proper decimal separator depending on system language
- improved long grass deco object and other older plants to have custom colors
- increased zoom range
- updated most trees to be resizable
- updated object highlighting to use an outline
- fixed visual artifacts around objects in front of water
- fixed game window getting resized when opening graphics settings menu after manually resizing the window
- fixed a case where the height of the Skyfall ride could not be changed
- fixed a very rare case where the UI could become unresponsive

- added Tilia shrub
- added camera acceleration setting
- added Soil terrain type
- added DLC trees to campaign map generator
- added modding support for swinging and spinning coaster cars
- updated shrubs to be resizable
- updated mod light effects to be useable with Effects Controller
- changed attraction highlight to use the attraction status color
- changed max length of switch track from 7 to 9
- changed Effects Controller to stay visible when hiding deco
- fixed shading on some of the new trees
- fixed synchronized stations not waiting correctly if there is only one train
- fixed resize hotkeys not working for effects
- fixed custom music not playing anymore after loading another savegame
- fixed missing guest faces/hair on systems with low performance
- fixed sounds not playing when using a modded camera
- fixed tracked ride stats label sometimes not showing up when building the track
- fixed river rapids sometimes getting stuck on bumpers in rapid water
- fixed lightning being able to break rides under construction
- fixed object outline on spotlight

Update 1.6b

- changed effects deco objects to stay visible when hiding scenery
- fixed a case where tracked rides would occasionally randomly derail
- fixed background music could occasionally stop playing or play twice
- fixed trees not being rendered properly on old macOS systems

Update 1.6c

- added Portuguese - Brazil translation (thanks to Erick and Tiago!)
- added modding support for textured objects with custom colors
- added object outline when picking objects in bulldozer tool, blueprint creation and scenario editor tools
- Booms & Blooms: added new fireworks effects: Ring, Sparkler
- improved effect editor performance
- changed fireworks launcher to be visible when scenery is hidden
- fixed water remaining outside map when shrinking map in scenario editor
- fixed bad collision detection on scaled trees
- fixed custom color slots for bobsled track
- fixed track segment triggers when train is driving reversed

The Multiplayer Update is released!

Hey everyone, the Multiplayer Update is now released!

Up to 8 people can play together, building the same park.
You can play sandbox parks together and also campaign scenarios.
The majority of mods are compatible with multiplayer mode. A few mods will need to be updated to be compatible.
You can select which DLCs to enable for a multiplayer session, so if you want to play with someone who doesn't have one of the DLCs installed you can do so by simply deselecting it.

When playing in multiplayer mode everyone works on the same park together. You can see what the other people are doing - it's a bit like everyone is playing together on the same PC.

Creating a new game or joining one is done through a lobby.
You can also directly invite your friends to join. It's pretty easy!

Changelog

- added co-op multiplayer mode! Now you can build parks with up to 7 other people together
- added a new background music track
- improved decoration score calculation speed
- fixed fences not sticking to terrain when terraforming
- fixed a case where decoration could be seen through the terrain
- fixed a bug where guest money setting would not be stored properly when editing a scenario

Cross-play between Windows/Mac/Linux systems is not available currently. We'll continue working on it.

If anything goes wrong during a multiplayer session you'll get an option for uploading an error report. We'll keep a close eye on those and will release patches as quickly as possible if any problems occur.

If you're having trouble with desyncs please try having all players join your multiplayer session lobby before starting the game. Joining mid-game is currently more likely to lead to desyncs.

Multiplayer Roadmap + Updates

Next steps

- fix desyncs!
- add permissions to be able to control who can change time, who can build where etc
- investigate cross-play for Windows/Mac/Linux

Changes

Version 1.7a / 1.7p1:
- multiplayer: added player count display to player list button
- multiplayer: fixed a desync that could happen when building fences
- multiplayer: fixed a desync that could be caused by shopkeepers
- multiplayer: fixed an error message in the multiplayer lobby

Version 1.7b:

- fixed train sounds not playing at the location of the train
- fixed settings for some mods not being configurable anymore
- fixed not being able to change car rotations, e.g. on Ghost Mansion Ride
- singleplayer: fixed not being able to bulldoze while the game is paused
- multiplayer: fixed a desync that could happen when playing with someone who doesn't have the same DLCs installed
- multiplayer: fixed a desync when using a custom music track

Version 1.7c:

- fixed after resizing a deco object that has been picked with the pipette tool it would snap to the ground and reset its rotation
- multiplayer: added options for filtering room list by public/private/full rooms
- multiplayer: fixed weird behaviour when scrolling in the multiplayer room list
- multiplayer: fixed a desync that could happen when closing a ride
- multiplayer: fixed a desync that could happen when joining a running game while certain flat rides are broken
- multiplayer: fixed a desync that could happen when deleting a zone
- multiplayer: fixed a desync when completing scenario goals after joining a running game
- multiplayer: fixed a desync when changing the 4D Cinema movie
- multiplayer: fixed a desync when trains derail while joining a game

Version 1.7d:

- fixed Customizable Shop not showing product list after loading savegame
- fixed Trash Chutes sometimes not being connected to paths anymore after loading savegame
- fixed a case where launch segments would not launch the train
- multiplayer: fixed a desync that could happen when spamming trees
- multiplayer: fixed a desync when building Splash Battle Ride targets
- multiplayer: fixed a case where players could have different research unlocked

Version 1.7e:

- improved decoration rating calculation speed by ~10%
- fixed a case where path signs would not remember their settings
- fixed Powered Coaster target velocity setting not working properly
- fixed trash bags not disappearing
- fixed trees not animating properly anymore after the game has been running for a while
- multiplayer: fixed decoration and rain protection ratings not working

Version 1.7f:

- multiplayer: added Discord integration. You can now invite your Discord friends to join your multiplayer session/join sessions through Discord
- fixed a case where replacing queue signs wasn't working properly
- fixed a case where guests might not enter queues properly if many people try to enter the queue at once
- fixed a case where employees would stop working when their assigned zone was deleted
- fixed missing Elevator entrance/exit after loading savegame
- fixed an error that could appear when trying to build some blueprints
- multiplayer: fixed a desync that could happen when someone leaves the game
- multiplayer: fixed a desync that could happen shortly after starting a multiplayer session
- multiplayer: fixed a desync that could happen after playing for some time and that would prevent rejoins
- multiplayer: fixed a rare desync when big animated deco is built
- multiplayer: fixed various other rare desyncs

Version 1.7g:

- added Alt+0 to subdivide the grid by 10 when building deco
- fixed build preview sometimes being slightly weird when drag-building paths
- multiplayer: fixed a rare desync when a guest leaves the park
- multiplayer: fixed a rare desync when deleting a path

Version 1.7h:

- fixed Ghost Mansion Ride cars not staying level on slopes
- fixed a case where guests could rest on vandalized benches
- fixed ride stats not updating in build challenge scenario
- multiplayer: fixed a desync that could happen when placing floating deco objects on water
- multiplayer: fixed a desync that could happen when building the Chocolate Fence
- multiplayer: fixed a possible desync when a guest wants to leave the park and a new player is joining
- multiplayer: fixed a desync when joining while a guest sits on vandalized bench
- multiplayer: fixed a possible desync when joining while a guest is entering a queue

Version 1.7i:

- added new default sandbox scenarios designed by Astrotron: Fantasy Park, Spooky Park, Sciene Fiction Park, Western Park
- fixed some animated deco not animating anymore
- multiplayer: replaced "kick player" with "ban player"
- multiplayer: fixed a desync when joining a paused game that contains boat rides
- multiplayer: fixed a desync when removing track segments while a player is joining
- multiplayer: fixed a desync that could happen when joining after building a tracked ride
- multiplayer: fixed a rare desync that could happen when opening a tracked ride

Version 1.7j:

- multiplayer: fixed a desync when testing or opening a hydraulically-launched coaster that just got edited

Update 1.7k (13 January 2021)

- added: Effect Controller can trigger other Effect Controllers now
- added scenario editor setting for terraforming costs
- changed autosave to keep two older savegame versions
- fixed an error that could appear when placing some flat rides near the terrain boundary
- fixed a case where newly hired employees could drown after being hired on some maps
- fixed a case where newly hired employees would hover instead of walk
- fixed a case where parts of guests (hair, backpacks, ...) could become detached and float around
- fixed font type being reset when duplicating 3D text signs with the pipette tool
- fixed guests not putting up hands on rides
- fixed missing effects when building some objects
- fixed bad supports on some coasters
- fixed "build every ride" achievement
- fixed "don't build while paused" challenge goal not working properly anymore
- fixed an error when trying to build paths outside the park bounds
- multiplayer: fixed a desync when changing the height of an elevator
- multiplayer: fixed a rare desync when it starts raining
- multiplayer: fixed a rare desync when a guest watches an attraction
- multiplayer: fixed a desync that could happen when using modded train types
- multiplayer: fixed issues when players join a room at the same time

Update 1.7l (14 January 2021)

- fixed an error that could appear in singleplayer mode when destructing objects
- multiplayer: fixed a desync when changing Mechanic/Janitor tasks

Update 1.7m (15 January 2021)

- fixed an error that could appear in singleplayer mode when destructing transport tubes
- fixed some objects being in the wrong order in the deco builder window

Update 1.7n (20 January 2021)

- added hovering over a path in decoration score visualization mode highlights sources of bad decoration rating that are visible from that path
- added color blindness mode (so far only changes colors used in decoration score visualization, let us know if any other places are causing problems)
- improved queue building to never form closed loops
- improved deco score calculation speed for savegames where the area outside the park is heavily decorated
- fixed a case where objects could have a wrong rotation when building a blueprint
- fixed some Mini Coaster sounds not playing at the right volume
- multiplayer: fixed not being able to build animated objects
- multiplayer: fixed a desync that could happen when joining a park with a Safari Ride
- multiplayer: fixed a desync that could happen when it rains
- multiplayer: fixed chat not visible when changing UI scale

Update 1.7o (21 January 2021)

- fixed some objects missing in decoration score calculations
- fixed a case where multiple trains could be used on multi-lap powered coasters
- multiplayer: fixed a desync that could happen when building through trees

Update 1.7p (21 January 2021)

- fixed an error that could appear after deleting objects

Update 1.7p2 (22 January 2021)

- fixed an error that could appear when hovering a path in decoration visualization mode
- fixed being able to build paths through objects

Update 1.7q (26 January 2021)

- added highlight for colliding objects when not being able to build something due to location being already occupied
- added option to Effects Controller to only trigger effects by day or at night
- fixed guest hats could sometimes briefly be in odd positions
- fixed a case where rain protection would not be properly updated after building roofs
- multiplayer: fixed a desync that could happen when guests are queueing for a long time
- multiplayer: fixed a desync that could happen after building roofs

Update 1.7q2 (28 January 2021)

- fixed broken blueprints when creating a blueprint that contains a path with path attachments