As far as I can tell, there isn't a spoiler tag available to add via the toolbar/BBCode:

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Spoilera story/puzzle spoiler

This would be useful given how plot and puzzle driven most adventure games are?

It appears you're right! We had discussed having functional markup codes at some point, but I guess that fell by the wayside.

Definitely something for us to look into, thanks!

How are things going with the implementation of the spoiler tags?

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SpoilerNot quite there.

I'd say we're progressing at about SpaceVenture speed.

Seriously, though, nothing to report yet. As mentioned elsewhere, none of us are programmers so we're entirely reliant on outside help for such things. Which means changes are likely to be slow in coming, then arriving all at once when then do.

I think it's just a case of downloading and unpacking the plugin into the /plugins/ folder, then enabling it in the admin options.
https://community.mybb.com/mods.php?action=view&pid=614

I'd say we're progressing at about SpaceVenture speed. 

...oh dear.

I'd say we're progressing at about SpaceVenture speed. 

...oh dear.

The Spoiler Tag feature is now available to the Kickstarter backers 

I reckon

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Spoiler

it works!

But I don't like how a message looks when only a part of the sentence is hidden. As shown above.

I'm giving it

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Spoiler

a try.

Thanks, Zobraks!