A richer unofficial FAQ can be found here

Typically you can't play a card because:

1. You aren't meeting the card's requirements.
2. The card requires placing a tile in a way that you may not achieve.
3. You're playing with Turmoil, and the card grants you a TR bonus, but you don't have the money for it.

You probably did get the resources. The app doesn't log everything that happens.

Isn't that annoying? Yeah, it is.

If we logged everything a) the log would get harder to read and b) the app would be at higher risk of crashing. So for now some things just don't get logged.

It's a bit awkward. We used to only log things that were special (e.g. we know that you got 1 heat production, you just played Micro Mills.) But we don't often know that your effect got you steel instead of titanium. Partly because code was different back then, and partly because we could run out of disk space of we logged everything.

Redoing how we log might work. /shrug.

https://github.com/terraforming-mars/faq/wiki#do-tags-on-event-cards-have-any-effects

In the physical game, event cards, once turned over, are out of play until the end of the game. The tags on those cards are used almost exclusively for discounts (e.g. the building tag for steel) or effects (e.g. earth tag discounts.) So event cards are almost exclusively ignored after they're played. Space events don't count for Toll Station, for instance. They don't count for milestones, and they don't count for awards, and their tags don't count for cards with VP per tag (e.g. Jovian events.)

The only way they count after play is that their VP icons are counted.

In solo mode, victory is decided immediately at the end of the last generation. So for instance, if you are playing the standard solo game, you will only win if you have maximized all three global parameters before placing final greeneries. In fact, placing final greeneries in solo mode does not raise the oxygen. And so, you cannot use final greenery placement to turn a loss into a win.

And so, the app behaves like so:

1. If haven't completed your solo objectives by the final generation, you do not get to place greeneries. It serves no point.

2. If you have completed your solo objectives by the final generation, you may place additional greeneries, which will increase your winning score.

   a. When playing the TR63 variant, final greenery placement does not raise the oxygen.

Other references: https://github.com/terraforming-mars/terraforming-mars/issues/2055 https://boardgamegeek.com/thread/1705209/official-faq-rules-clarifications (see 'Solo endgame')

On the main server, games are automatically purged after 17 days. Different servers may have different purge rates (which they can do with the MAX_GAME_DAYS environment variable.)

Games are purged in order to prevent the server from running out of storage. There was a bug in game purging during December 2022, and we ran out of database space, and nobody could do anything.

Is it possible to extend the game by a day or two? Short answer is no.

Longer answer? Well, anything is possible, but it's manual, difficult, and can put the server at risk. And that's intentional because then everybody would ask for an extension.

Every once in a while we can look at storage and predict whether it's reasonable to add on a day. But we really don't want December 2022 all over again.

Spending resources that would raise a global parameter are legal even after it's reached it's goal. From the rulebook:

When a global parameter has reached its goal, it can’t be raised any further, and so does not increase your TR. You may still play cards and actions that increase the parameter - just ignore that part of the effect.

As to why, it's useful in hotly contested games when a player wants to take several actions in order undisturbed. If a player has spare heat (or gasp, spare money) raising the global parameter as an action lets them keep playing without having to pass. This is generally referred to as a "stall action."