Pokémon Shuffle is one of multiple 'mon free-to-start downloads on 3DS, and has also been released on mobile. A major update to version 1.3.0 for the 3DS iteration has now, seemingly, brought it into line with features that have previously rolled out on smart devices.
First of all, if you're jumping into the app for the first time in over 30 days after completing the update - like this writer - you get a gift of 10,000 coins and 30 hearts, which should allow for plenty of free playtime. Everyone that does the update gets 3000 coins, to, in addition to a new 'raise max level' item to use on one of your Pokémon.
There are some user interface improvements, such as viewing a Pokémon's level progress or fast travelling between stages - SpotPass notifications can also be turned on. A key addition is a Survival mode for those past level 150, which is rather self-explanatory, and beyond that general good play in various stages and modes can earn you 'Mission Cards'. Earn cards and get rewards such as items that'd normally cost you a lot of collectibles or micro-transactions.
It's a meaty update, all told, and could certainly add a bit of extra life to the puzzler - check it out and let us know what you think.
Thanks to RupeeClock for the heads up.