The first player to make a successful landing on Mars or beyond (1,000x+) with a minimum bet of 0.0001 BTC or greater will win a bonus 25x added directly from MintDice. For example, if you were to bet 0.001 BTC and stop at exactly 1,000x, you'd win 1 BTC + a 0.025 BTC bonus.
This makes Bit.Rocket completely profitable to play for the eventual winner since our house edge is lower than the expected payout bonus, especially if you join early before any rush of new sign-ups.
Extra side notes:
1. Only one promotion will be paid, but it can be distributed in a couple different ways. If more than one eligible player make it to Mars, the player with the highest multiplier will win the promotional bonus to themselves. However, the highest win must be at least 10% higher than the player before (this prevents stalemates where someone can instantly cash out after another player, so it mildly protects those who cash out earlier). If they do not exceed a 10% advantage, this will count as a tie and the prizes will be split accordingly. For example, if someone cashes out at exactly 1,000x, the surviving player(s) must cash out at least at 1,100x win it for themselves. If someone were to do exactly this, the next valid cash out would be roughly 1,210x and so on. If multiple players make it to Mars but no one cashes out waiting for the others to cash out, no one wins and the promotion continues on until there is a safe Mars landing (or beyond). If any weird mathematical overlapping situations happen, which are possible, MintDice will do their best at a proper judgement call.
2. Our max bet allows for wins as large as 3.5 BTC presently. It is a crowdfunded casino bankroll. The largest bet presently that one can place and still win this promotion is about 0.0035 BTC. We will cover promotional wins up to a bet of 0.01 BTC (presently impossible and would require a few more million dollars in bankroll investment). This means we are presently offering up to around ~$875 in free value to the lucky winner and up to ~$2,500 in value as an upper limit if that were to exist during the promotion.
3. We encourage any players/winners/witnesses to take screenshots and post, especially so if there is a winner and can show the escape pod + user name near Mars
We will likely reward this behavior to the first person to post the winning screenshot(s) here on BitcoinTalk 
4. We may run this promotion more than once if it receives good feedback and are open to suggestions to make this better in the future.