Board Game Arena

Game 392676608 - I have connected the research institute with a sponsor building only. Maybe that is the problem.
If its not, I would have expected to play the Sumatra Tiger from hand:
Space4 - check
two microscopes - check
money - check (not anymore, but when I tried to play it)
2 water connections - only one, therefore the research institute

Still the card was unplayable grey, so I am missing one important rule.....

Water/rock adjacency is a requirement, not a condition(like upgraded animals). If you could choose to ignore requirement you could choose to not pay for the animal or not put it in an enclosure

I wish there were a way to make it more visible, but the BGA Ark Nova FAQ is always a good place to start with questions like this: https://boardgamearena.com/bug?id=86536

In the second comment:

== MAP 6 ==
- You cannot ignore rock/water requirements. See the glossary. You can only ignore conditions (red bars).