To make both fans of the first game and modern gamers happy, the game developers kept many of the old gameplay features and added some new ones as well. Older gameplay features include never reloading your weapon, having all weapons on you at all times rather than just two weapons, having a traditional health bar rather than health regeneration, running at full speed at all times, rewarding offensive gameplay rather than defensive gameplay, and defense being based on strafing (moving out of the way) rather than taking cover. Gameplay features that are new to the series include melee-based finishing moves called Glory Kills, most weapons having two different secondary firing modes that can be bought and switched out at any time, platforming similar to the games, weapon challenges to upgrade your weapons, and arcade-style challenges to upgrade your suit. The art style is also a mix of "Doom" and "Doom 3".