Much improved animation for the diamond:
Meanwhile, zombies deactivate collectibles (so, we have a use for that monochrome diamond after all!). This requires collectibles to have an additional graphic for the deactivated state, or at least some sort of animation handling when a collectible has been disabled by a zombie.
All that remains now is to decide what to do when all diamonds have been collected. Possible ideas:
Activate
invincibility mode for the lem that collects the final diamond
Unlock a secret level
Reveal an alternative exit (or, maybe the final diamond could become an exit)
Set all skills to infinity-of-each (this would differ from the Infinite Skills hotkey in that it
wouldn't activate "Infinite Skills mode", so player records would be saved and it would count as having solved the level)
Clone all lemmings, or just the lemming that collects the final diamond (just riffing now)
Ideas welcome!
Collectibles will be available as of SLX 2.7 even if we haven't decided on what to do when all are collected. This can be something we decide later, even if the decision is ultimately to do nothing. Currently, we simply record that all diamonds have been collected - this is then shown in the level select, and on the preview screen. That may be sufficient, but it's worth discussing the possibility of an in-game reward whilst the feature is still very much in development.