At Amazon, download any of the listed apps from its Underground store and get a $5 Amazon Credit for free. (Follow the instructions here to download the app.) Deal ends April 7. The apps, with comparisons assuming you'll use the $5 credit:

• Five Nights at Freddy's 4 for Android for $2.99 (pictured, low by $5)
• Ticket to Ride for Android for $2.99 (low by $9)
• Kingdom Rush Origins for Android for $2.99 (low by $5)
• Photo Lab Pro for Android for $2.99 (low by $5)
• Pac-Man HD for Android for $2.99 (low by $5)
• Relax Melodies Premium for Android for $2.99 (low by $5)