What You're Actually Looking For
Biology gameplay isn't one single thing. It's a scattered mess of simulators, educational games, mod packs, and YouTube speedruns that barely overlap. If you're hoping to find a clean central hub where everything is sorted and labeled properly, you won't. I spent three weeks last year trying to locate a specific set of cell simulation resources for a friend's teacher and ended up with 147 broken links and two defunct forums. The core categories run like this: desktop simulations (Osmos, Cell to Singularity, Evolution), mobile apps (Bioma, Plants vs. Zombies has a weirdly biological angle), browser-based labs (Labster, PhET), and actual video game content on YouTube or Twitch tagged under biology. The problem is that most people asking this question don't actually know which category they fall into.
Where To Find Biology Gameplay
Start with Steam if you want downloadable content. The tag "biology" pulls up hits like Spore (older now but still relevant), Species: Assembly, and a handful of indie simulators. Steam's filter system is awful for niche topics, so don't bother searching by genre. Search by gameplay type instead. Type in "simulation" and then filter for biology-related content in the tags sidebar. You'll find the right stuff faster. For browser-based options, PhET Interactive Simulations from the University of Colorado is the baseline. It's free, no account needed, and honestly covers more ground than most paid alternatives. The cell structure and photosynthesis modules are stable. I use them to demo protein folding mechanics because the visual clarity here beats any commercial product I've tried. Labster is the other major player but it's subscription-based and aimed at institutions. If you're an individual looking to get in, you'll hit a paywall within five minutes of clicking around. There's a free trial but it's heavily limited. Not worth it unless your school already pays for it.
YouTube channels like Amoeba Sisters and CrashCourse Biology have embedded gameplay moments, but that's not what you're after. What you actually want is content creators who let viewers play through biology games in real time. Search for "biology game walkthrough" or "cell simulator gameplay." The results vary wildly in quality but you can usually spot decent creators by their view counts and comment sections. For mobile, the App Store and Google Play search for "biology simulation" brings up roughly twenty apps. Most are low effort. Bioma is one that actually works well. It's a sandbox-style creature builder that teaches genetic concepts without being preachy about it. Another solid option is Kingdom Come, which is less about biology and more about ecology, but the simulation depth is there. I ran into a specific problem with Labster's browser-based lab simulations last month when my network kept timing out on the VR mode. The workaround was disabling VR rendering in the settings and using the standard 3D view. VR adds nothing meaningful to most biology labs except latency issues. It's a distraction.
Get the Full Details

A few counter-intuitive things about this space that nobody warns you about. First, many of the best biology games aren't marketed as biology games. Spore is a creature creation tool disguised as an evolution simulation. Kerbal Space Program has surprisingly accurate orbital mechanics taught through trial and error. If you're only searching biology-specific tags, you're missing half the good content. Second, the community around these games is small and fragmented. Discord servers exist for a handful of titles but most have fewer than 500 members. You won't find the deep wiki-level documentation you'd expect. When something breaks, you're mostly on your own. The biggest bottleneck in this space is content decay. Games get abandoned. Servers shut down. YouTube links rot. I've lost track of the number of educational biology games from 2018 to 2020 that simply no longer function. Always check the last update date on any tool before committing time to it. If it hasn't been touched in two years, assume it's broken.
If you want one reliable starting point, go to Steam, install Osmos and Spore, and browse the PhET site. That covers roughly 80% of what most people mean when they ask about biology gameplay. The remaining 20% is scattered across smaller platforms and requires more effort than it's worth unless you have a very specific need.