Is krarks thumb programmed correctly? I can't see every flip so I don't know, but with three thumbs I'm losing way more flips than I should be. Each thumb should double the number of coins you flip, so 3 thumbs should flip 8 coins. The odds of not getting 5 wins in a row are 1.94%. But in testing just now, I failed at least one of the 5 in a row with 6 of the 10 attempts I made.
I'm on android, but the version number isn't shown. Should be up to date.