The MW3 and Warzone Season 4 Week 5 challenges are currently live. In this week, the titles hosts seven weekly challenges for the players from each of the game modes, i.e., the Multiplayer, the Zombies, and the Battle Royale. Each of these challenges promises XP rewards and completing any five out of the seven challenges in any of the modes will unlock this week's final reward, which is a new weapon.In this brief guide, we will take a closer look at all the MW3 and Warzone Season 4 Week 5 challenges, how to complete them, and all the rewards that they bring.All Warzone and MW3 Season 4 Week 5 Challenges and their rewardsMW3 MultiplayerAll MW3 Multiplayer Season 4 Week 5 challenges and rewards (Image via Activision)MW3 Multiplayer Season 4 Week 5 challenges are quite straightforward and you can complete them easily within a few matches. Here's what this week entails:Weekly challengesRewardsGet 30 Operator Assists2500 XPGet 15 Operator One Shot One Kills with Recommended Shotguns5000 XPPerform 3 Finishing Moves on Enemy Operators7500 XPGet 2 Operator Fury Kills with a Recommended Weapon10000 XPGet 10 Operator Kills with the Gun-Butt of a Recommended Weapon5000 XPGet 12 Operator Kills with Claymores, Proximity Mines, or C45000 XPGet 3 Operator Melee Double Kills7500 XPNote: Fury Kills require you to get four eliminations in quick succession.MW3 ZombiesAll MW3 Zombies Season 4 Week 5 challenges and rewards (Image via Activision)Similar to Week 4 challenges, the MW3 Zombies Season 4 Week 5 challenges are not difficult by any means and can be completed in a few infils. That said, you should prepare for them before going in so that you can attempt multiple tasks at once.Here are all the challenges and their rewards:Weekly challengesRewardsComplete 10 Contracts2500 XPGet 250 1 Shot 1 Kills with a Pack-A-Punched Recommended Shotgun5000 XPPerform 5 Finishing Moves on Mercs7500 XPGet 5 Rapid Kills 30 times with a Recommended Assault Rifle10000 XPGet 75 Kills with the Gun-Butt of a Recommended Weapon5000 XPGet 75 Kills with Claymores, Proximity Mines, or C45000 XPGet 10 Kills without being hit 20 times with a Recommended Melee Weapon7500 XPWarzone (Battle Royale)All Warzone Season 4 Week 5 challenges and rewards (Image via Activision)The Warzone Season 4 Week 5 challenges are also easy and mostly require you to get kills in certain parts of the Fortune's Keep map. Here are all the challenges:Weekly challengesRewardsIn Fortune’s Keep, Get 10 Operator Kills in the North Region (Gatehouse, Keep, Terraces)5000 XPIn Fortune’s Keep, Get 10 Operator Kills in the East (Konni Outpost, Lighthouse, Pier, Winery)5000 XPPlace in the top 10 5 time(s)10000 XPOpen 50 Loot Caches2500 XPIn Fortune’s Keep, Get 10 Operator Kills in the West (Graveyard, Overlook, Town)7500 XPIn Fortune’s Keep, Get 10 Operator Kills in the South (Ground Zero)7500 XPComplete 10 Contract(s)5000 XPFinal reward for completing MW3 and Warzone Season 4 Week 5 challengesThe final reward for completing MW3 and Warzone Season 4 Week 5 challenges is the new Sledgehammer Melee Weapon. To unlock it, you must complete any 5 out of the 7 MW3 and Warzone Season 4 Week 5 challenges.The Sledgehammer is a powerful melee weapon that you can use to annihilate opponents in seconds. It boasts a 20-pound carbon steel head that can stop them dead in their tracks. You can swing it, pole butt, and overhead smash your enemies, which are guaranteed to instantly eliminate them.That covers all MW3 and Warzone Season 4 Week 5 challenges and the rewards they bring.Check out the previous weekly challenges for Warzone Season 4:MW3 and Warzone Season 4 Week 1 challengesMW3 and Warzone Season 4 Week 2 challengesMW3 and Warzone Season 4 Week 3 challengesMW3 and Warzone Season 4 Week 4 challengesAlso, Check out our other Call of Duty articles:Every weapon buff and nerf in Warzone Season 4 ReloadedAll new events in Modern Warfare 3 and Warzone Season 4 ReloadedHow to unlock the Helical Reverb Camo in MW3 and Warzone