Thank you everyone for sharing your thoughts and opinions about Sandbox and Challenge Mode. To clarify: You can unlock dinosaurs and park features for Sandbox Mode by researching them in any mode. For example, if you research the Brachiosaurus in any level, the Brachiosaurus will immediately be available to bio-engineer in a Hatchery in Sandbox Mode.
As we mentioned in the article above, you'll have access to different ways to tweak Sandbox Mode to your liking, and we'll have more to share about all the settings at a later date.
For Challenge Mode, you can choose your difficulty and jump straight to Jurassic Difficulty if you so choose. We're leaving the unlocks up to you to discover, however!
The Conditions and what you have available to achieve are different from level to level in Challenge Mode, but Challenge Mode doesn't use completely different maps to the campaign.
And we'll have more to share about it in the future!
Will sandbox mode have a weather cycle that moves between weather types based on the biome the map being played is in? JWE 1 sandbox had no weather cycle sadly. It was always just one type or none.