Datagame is a MaxDiff gamification tool, in which features and levels are displayed on virtual playing cards. The respondent is dealt a series of hands and then asked which hands to keep and which ones to discard. There are different settings for card format, the ability to include visuals or stimuli, and other tweaks that make it fairly flexible. The reason that I began using Datagame is the ability to integrate into a Qualtrics survey (a text question with JS coding behind the scenes). It is a good tool.
A few things could be improved. First, they should price on the basis of projects and not a subscription. I may conduct a couple of max-diff exercise a year, so a subscription doesn't make much sense for me. Also, at the time I used it (late last year) there wasn't a clear delineation between what was offered in the "basic" version versus "premium" version. Last, I could not link the results to my Qualtrics survey via the response ID. That almost ruined the study for me; fortunately they were able to rescue the data linkage.
Give it a try - I think that you will be pleased.
Determining demand for a new product.