"Whether you're in airplane mode or stuck with zero bars, all these games require is your thumb. Now you can play your heart out from anywhere with our selection of off-line games," says Google.
Maybe Google should allow users to create their own collections they could share with other people. A Google search reveals a lot of Google Play collections: Get Things Done, Essential Games, Abstract Puzzlers, MMORPGs, Hidden Gems, Mood Boosters, Picture Taking, For The Power User and more. There are also music collections, movie collections, books collections, Newsstand collections.