Tom Clancy's Rainbow Six Siege Free Weekend

Ubisoft is offering everyone a week of free access to Tom Clancy's Rainbow Six Siege, hoping to enlist more recruits into the tactical team-based shooter. The Windows edition is currently free on Steam, and if you decide you do want to carry on, it's on sale for 60% off. Here's a refresher:
Tom Clancy's Rainbow Six® Siege is an elite, realistic, tactical team-based shooter where superior planning and execution triumph. It features 5v5 attack vs. defense gameplay and intense close-quarters combat in destructible environments.

On defense, coordinate with your team to transform your environments into strongholds. Trap, fortify and create defensive systems to prevent being breached by the enemy.
On attack, lead your team through narrow corridors, barricaded doorways and reinforced walls. Combine tactical maps, observation drones, rappelling and more to plan, attack and defuse every situation.