You can definitely use Roll20! Roll20 doesn't have prebuilt functionality for a particular game. The community does provide character sheets, but as a player/GM, you setup the rolls you want either by typing them in directly: /roll 2d10 or by creating macros, which are just a collection of commands you can run with a single instruction or button. There are lots of options for how to create rolls (see: <a href="https://wiki.roll20.net/Dice_Reference" rel="nofollow">https://wiki.roll20.net/Dice_Reference</a>). It looks like Witch Hunter uses exploding dice (max value is counted then rerolled) and a number of successes. Assuming your roll was 7d10, here is the formula for rolling with exploding dice ( ! after a dice expression) and counting successes as a number equal to or greater than 7 ( > in this since is equal to or greater, which flubs up some of us... =D ) /roll {7d10!}>7 Here's what that looks like in Roll20 (with 3 exploding 10s): And here it is with some failures: The maximum value of a die is always shown in Green, 1 is always shown in Red. You can also use the inline dice syntax: My check for hunting that witch: [[{7d10!}>7]] which makes prettier macros. Here's what the result of that command looks like: The result of the expression is all that is displayed (4 in this case). Pointing to the box will show the full roll with results (10,8,8,7 were successes). The outline of the box will be Green if there was at least one max die value rolled, and Red if there was at least one 1 rolled. It is Blue if there was at least one 1 and one max die value (as in this case). Hope that helps!