I know some people probably think "good freemium" is an oxymoron, but I'm doing a bit of research into the best way (or if) it could be done within the TD genre. The kinds of freemium I really dislike and avoid are where the value is unclear and overall confusing. Say you start playing something and pretty soon you're not going to get any further without a coin pack - but how much progress are you buying? How many times will that be necessary? etc... On the flipside, an example where I think it's used really nicely would be for example Hero Acadamy, where you can essentially experience the game and play it in complete form, and then optionally buy the other factions if you want to (which i personally did). One thing I haven't seen though is a freemium Tower Defence example done well (not sure I've seen any freemium TD actually), but I'm hoping some one can point me in the right direction. I would think maybe I'd do a basic level-set that more or less shows the game, then to get into it properly would be a once off iAP for all the main levels. Any other iAPs after that would be totally non essential. If you're wondering why do this it all? I guess for me it's something new to try. The best potential it has in my view is to act as a more advanced and elegant version of the lite/paid staple.