I love graphically detailed, ambitious games as much as the next mobile gamer, but up to 7GB (installed) is taking the biscuit just a little. Mind you, any Windows 10 phones right now, outside the Insiders Programme, will have microSD support so, if your bandwidth can stand it, then why not? It's a freemium multi-player, multi-platform tank combat game - I haven't played it, but the link and promo video are below...

From the Store entry:

World of Tanks Blitz is a free-to-play mobile MMO action game brought to you by Wargaming, the award-winning online game developer and publisher of World of Tanks, the smash hit PC game now with over 110 million players worldwide! Drawing inspiration from the hugely popular World of Tanks, World of Tanks Blitz introduces crossplatform tank combat for a variety of devices including Windows 10 PCs, tablets and phones. With an impressive roster of over 200 massive tanks, stunning graphics, intuitive touch-screen controls for tablets and phones, as well as keyboard and mouse support for the PC version, World of Tanks Blitz makes it easy to jump into short, action-packed 7vs7 tank battles no matter where you are!

• A truly free-to-play game. No timers, energy bars, or fuel—play as much as you want, whenever you want.
• Over 200 iconic vehicles from Germany, Great Britain, the United States, the USSR and Japan
• 4 different vehicles classes including light tanks, medium tanks, heavy tanks, and tank destroyers
• Strategic 7v7 online multiplayer gameplay
• 18 unique battle arenas
• In -game chat functionality
• Innovative crew upgrade system
• Constant graphical enhancements and updates, as well as optimization for various devices
• Real-life physics to create authentic tank movement and damage mechanics
• Detailed tutorials
• Ability to invite your friends to play online
• In-game achievements
• Free to play with equal access to in-game elements for paying and non-paying players
• Battle Missions that open up fresh, personalized challenges of varying difficulties and enable players to earn bonuses and achievements
• Clan functionality allowing players to unite in their pursuit of victory

Pretty impressive in ambition. Here's the video promo:

A few screens from the Store entry:

Not mentioned in the requirements is that this is Windows 10 Mobile only. And, as I say, for devices with a big microSD card only. And make sure that your apps installations are set to 'SD card' before starting with World of Tanks!

You can grab this freemium epic (over wi-fi, hopefully!) here in the Store. If you try this, any comments on install/loading times and gameplay? It says that it runs on devices with 1GB of RAM, but it'll get thrown out of memory every time you do anything else, so.... I'd suggest this is perhaps for the Lumia 930 upwards.