What's is the best game under £4 in your opinion?

http://store.steampowered.com/app/328500/

Overlord -- pick your alignment (good, neutral, or evil) and wreak havoc across the lands....or be a peacekeeper.

Anomaly: Korea -- a popular smartphone port, tower offense game.

Five Nights at Freddy's -- click 'n point horror game that is very popular on Steam.

If you like puzzle games, there's a bunch of good ones for cheap. First that come to my mind is Lyne

The Binding of Isaac

clicky
thank me later

Easiest question ever. Not to get your hopes up, but prepare yourself.

$2.99 (not $4, or £4) gets you:

Overwhelmingly Positive reviews
Wagons with guns
More guns
Unicorns
Bigger guns
Buffalo for target practice
Dragons
Traders who want to sell you supplies
Pirates
Wagon white-water rapids crossing
Dark Caves with LOOT
Zombies
Jealous Friends who don't have this.
100% Historical Accuracy

As one reviewer put it, The Oregon Trail as directed by Michael Bay.

Buy it now, or the Buffalo win.

Super Amazing Wagon Adventure

One Way Heroics

Super Hexagon

Terraria or Binding of Isaac or Risk of Rain.

Sakura Spirit ( ͡° ͜ʖ ͡°)

Just buy Bad rats you won't be disappointed.

Fortix ?