Flexbox Defense is described as 'A tower defense game where you position your towers using CSS!' and is an website in the Development category. There are five alternatives to Flexbox Defense, not only websites but also apps for Self-Hosted solutions. The best alternative is Flexbox Zombies, which is free. Other great sites and apps similar to Flexbox Defense are Flexbox Froggy (Free, Open Source), Super Markup World (Free, Open Source), Grid Garden (Free, Open Source) and CodePupil (Free).