What sandbox games are and why they behave differently on your network
Sandbox games like Minecraft let players build, explore, and create in open worlds with few rules about what you can do. Unlike games with a set story or path to follow, sandbox games give you a blank space and tools. Minecraft is the most common one — it runs on Windows, Mac, Linux, phones, tablets, and gaming consoles. Other sandbox games include Roblox, Terraria, Stardew Valley, and No Man's Sky.
These games matter for your home network because many of them work in two very different ways: single-player mode, where the game runs only on your device, and multiplayer mode, where your device connects to other players' devices or to a server. Single-player uses almost no network traffic. Multiplayer can use a steady stream of data, which affects your internet speed and can expose your device to other players on the network.
Understanding which mode you are using, and what data gets sent where, helps you set up parental controls, manage bandwidth, and keep your device safe.
Key Takeaways
- Minecraft single-player mode does not need internet and uses no network data, while multiplayer modes (Realms, servers, or local network play) send data about player location, chat, and actions to other devices or servers.
- Roblox and similar user-created-content games read code from the internet every time you play a new world, which carries more risk than games with fixed content.
- Parental controls work differently on each platform — console parental controls block multiplayer entirely, while computer and phone parental controls usually let you restrict who players can talk to.
- Sandbox games on mobile devices often include in-game purchases and ads, which you can disable through device settings before handing the device to a child.
- Local network play (playing with others on your home WiFi) is safer than public servers because you control who joins, but it still requires you to open ports or use a VPN if players are outside your home.
Single-player versus multiplayer: what data leaves your device
In single-player mode, the game world exists only on your device. Nothing about your gameplay — your location, what you built, what you said — leaves your computer or phone. You can play offline. Minecraft single-player, Stardew Valley, and Terraria single-player all work this way. This is the safest mode for children because there is no contact with other players and no data collection beyond what the game developer stores locally on your device.
Multiplayer modes send data constantly. In Minecraft Java Edition multiplayer, your device sends your location, the blocks you place or break, and any chat messages to a server or to other players' devices. Minecraft Realms (the official subscription service) sends this data to Microsoft's servers. Third-party servers send it to whoever runs that server. Roblox sends your location in the game world, your avatar appearance, and chat to Roblox's servers and to other players. This data is necessary for the game to work — other players need to see where you are — but it also means your child's activity is visible to strangers.
Local network play is a middle ground: you can play multiplayer with other devices on your home WiFi without sending data to the internet. Minecraft has a "LAN world" feature for this. The data stays inside your home network, but your device still sends and receives information from other devices on that network.
Understanding content risk: fixed games versus user-created worlds
Sandbox games fall into two categories by content risk. Games with fixed content — Minecraft, Terraria, Stardew Valley — have worlds and items created by the developer. The content does not change unless the developer updates the game. Your device downloads the game once, and then plays it. This is lower risk because you know what content exists.
Games with user-created content — Roblox, Garry's Mod, Unreal Engine games that use the Marketplace — read new code and worlds from the internet every time you play. A Roblox "game" is actually a small program written by another user, downloaded to your device, and run. This is higher risk because you cannot know what that code does before it runs. Roblox has moderation, but moderation is not perfect. User-created games can contain inappropriate content, scams, or code that behaves badly.
If you are setting up a sandbox game for a child, fixed-content games are simpler to manage. If you choose a user-created-content game, you will need to monitor which worlds or games the child plays, or use parental controls to restrict access to games rated for their age.
How to set parental controls for sandbox games on each platform
On Windows and Mac: Parental controls live in the operating system, not in the game. On Windows, go to Settings > Accounts > Family & other users, then set up a child account. You can restrict which games install, set screen time limits, and see activity reports. On Mac, go to System Settings > General > Parental Controls. These controls work for any game, including Minecraft and Roblox. However, they do not let you control who the child talks to in multiplayer — that is a game-level setting.
On gaming consoles (PlayStation, Xbox, Nintendo Switch): Each console has built-in parental controls. On Xbox, go to Settings > Account > Family settings. On PlayStation, go to Settings > Family and Parental Controls. On Switch, go to System Settings > Parental Controls. You can restrict online play entirely, which blocks multiplayer modes. You can also restrict communication with other players. These controls are the most restrictive option — if you turn off online play, the child cannot play multiplayer at all, but they can still play single-player Minecraft or Roblox offline.
On phones and tablets (iOS and Android): iOS has Screen Time (Settings > Screen Time), which lets you restrict app installation and set time limits, but does not control in-game communication. Android has Family Link (set up in Google Play), which works similarly. Neither system lets you restrict who a child talks to inside a game — you have to rely on the game's own parental controls. Minecraft on mobile has a "Multiplayer" toggle in settings that you can turn off. Roblox has a "Parental Controls" menu in settings where you can restrict chat and user-generated content.
Managing bandwidth: how much data sandbox games actually use
Single-player sandbox games use almost no internet data — a few megabytes per hour at most, mostly for background updates. Multiplayer uses more. Minecraft multiplayer on a public server uses about 100 to 300 kilobytes per hour of gameplay, depending on how many players are on the server and how much is happening. Roblox uses similar amounts. This is not enough to noticeably slow down a home internet connection for other devices, unless you have very slow internet (under 5 Mbps) or many people playing at once.
The bigger bandwidth issue is usually the initial read. Minecraft is about 500 MB to 1 GB depending on the version. Roblox is smaller but downloads additional content as you play. If your home internet is metered or slow, let the game read overnight or on a WiFi network with no data limits.
If you are concerned about bandwidth, turn off auto-updates in the game settings and check for updates manually once a week. You can also restrict multiplayer play to certain times of day using parental controls, which prevents background data use during other hours.
Keeping your device safe while playing multiplayer sandbox games
Multiplayer sandbox games expose your device to two main risks: contact with strangers and malware from user-created content.
Contact with strangers happens through chat. In Minecraft, you can turn off chat entirely in the settings menu. In Roblox, you can restrict chat to friends only (in settings, go to Privacy > Who can chat with me > Friends). On consoles, you can disable voice chat and text chat through parental controls. Teach children not to share personal information — real name, school, address, phone number — with other players. Sandbox games do not ask for this information, but other players might.
Malware risk comes from user-created content in games like Roblox. The game itself is safe — Roblox runs user code in a sandbox, which means the code cannot access your files or install software. However, some user-created games contain scams (asking you to buy fake items) or inappropriate content. The best protection is to play only games that have been played by many people and have good reviews. Avoid games with very few players or very new games. Roblox shows how many people are playing each game — stick to games with thousands of concurrent players.
For Minecraft specifically, only read mods and texture packs from official sources like the Minecraft Launcher or CurseForge. Do not read mods from random websites, as they may contain malware.
Setting up local network play without exposing your home network
Local network play lets you play multiplayer with other devices on your home WiFi without sending data to the internet. Minecraft has a "LAN world" feature: the player who creates the world goes to Pause Menu > Open to LAN, and other players on the same WiFi can see and join that world. This is safe because the data never leaves your home network.
If you want to play with people outside your home, you have two options. The first is to use the game's official service: Minecraft Realms costs about $8 per month and lets you invite specific players to a world. Roblox is free but uses Roblox's servers. The second is to rent a private server from a third party, which costs more but gives you full control over who plays. Private servers are more technical to set up and are usually only worth it for groups of friends who play regularly.
Do not try to open ports on your home router to let outside players connect directly to your device. This exposes your home network to the internet and is a security risk. Use the game's official service or a private server instead.
In-game purchases and ads on mobile sandbox games
Minecraft on mobile (iOS and Android) costs about $7 once, then has no ads or in-game purchases. Roblox on mobile is free but includes in-game purchases (called Robux) and ads. Stardew Valley on mobile costs about $15 once. Terraria costs about $5 to $7.
If you give a child a device with Roblox installed, turn off in-app purchases before handing it over. On iOS, go to Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > In-app Purchases and set it to "Don't Allow". On Android, go to Google Play > Settings > Family > Family Link and turn off "Allow purchases and downloads". This prevents accidental or intentional spending.
Ads in Roblox appear between games and in some menus, but not during gameplay. They are usually for other Roblox games or for products aimed at children. You cannot disable ads without paying for a premium membership, which costs about $5 to $15 per month depending on the tier.
Frequently Asked Questions
Can my child play Minecraft with their friends if we do not have a Realms subscription?
Yes. If the friends are on the same WiFi, use the LAN world feature. If they are outside your home, you can use a free third-party server like Aternos or Minehut, though these are slower and less reliable than Realms. The friend who creates the world shares the server address, and other players type it into their Multiplayer menu to join.
Is Roblox safe for children?
Roblox has moderation and age-appropriate game categories, but user-created content is not perfect. Stick to games with high player counts and good reviews. Use the parental controls to restrict chat to friends only and turn off in-app purchases. Monitor which games your child plays, especially if they are new or have few players.
What happens if my child talks to a stranger in a multiplayer game?
Most sandbox games have chat logs that you can review. If a stranger asks for personal information or makes your child uncomfortable, report them to the game's moderation team using the in-game report button. Save screenshots of the conversation. Do not delete the chat — moderation teams need to see it to take action.
Do sandbox games work without internet?
Single-player modes work completely offline. Multiplayer modes need internet. Minecraft single-player, Stardew Valley, and Terraria single-player all work on a device with no internet connection. Roblox requires internet for any mode. Minecraft multiplayer requires internet to connect to a server.
How much does it cost to play sandbox games?
Minecraft costs about $7 to $27 depending on the platform (mobile is cheapest, console versions are more). Realms costs about $8 per month. Roblox is free but includes optional in-app purchases. Stardew Valley costs about $15 on mobile. Terraria costs about $5 to $7. Most sandbox games have no subscription fee except Realms and Roblox premium membership.