From the main Blue Max page:

Challenge Pending games
You've been challenged! You can either subscribe to the game(s) in this list or refuse the challenge. If you don't want to play it, simply refuse the challenge and the game will be deleted. If you don't subscribe nor refuse a pending challenge game, after 7 days it will be deleted anyway.

465341: BMBug. Subscribe... or Refuse! [1/2]. 8x8 Board, Advanced rules no pilot killed chits, move timeout in 5 days. Challenge game for: ksnake and BMBug. Created: 3' 59" ago.

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How am I to know what sort of game I am being challenged to? It does not say, nor is the game number hyperlinked to info about the game.