a stupid question, can gambling website be playable offline?
sure thing! You must just own your entire gambling site(php, server etc) on your computer, and then you play it until you are bored. But you will probably earn what you put on your wallet(because it will take your money from your wallet to pay your winning, so it's a loop)
You can't win more than what you have and you can't make your money grow.
By the way, back to the topic.
I mostly do a tricky trick. Well it's not a trick, but a prove of luck.
Let's say I have 100K satoshi and wanna find more than 99.50 as a roll.
What the server will do?
I set my own client, and let the bot run 500 satoshi per hit. and just for pure luck for who knows the 199 bet is a winning one. and so I win my 100K back. Or better. at number 72 and 199 I get over 99.50, and I have a profit of 200K.
I do the same, Change the client seed, add some pepper and decide to bet 2K for bet, and at the 3rd I win big.
I took examples from my own experience on the website.That's why I'm talking.
And my example doesn't even involve martingaling.