While most people probably know the basics of sending and receiving messages with the service, Facebook Messenger has a number of hidden features that many users don’t even realize are available to them. You’ve probably heard friends refer to them as “hidden messages on Facebook” but, in reality, many of them involve more than just a simple message. These features range from secret chats to hidden games. Let’s see what the features are, how they work, and how you can best take advantage of them.

Use Messenger in its Own Window

If you want to chat without the distractions of the rest of Facebook, run Facebook Messenger in its own window. That means you can chat with friends all day on the service without fear that you’ll end up losing an hour looking at videos of a friend’s new puppy. To get to the Messenger page, just go to messenger.com in your browser. From there, you’ll be prompted to enter your Facebook credentials, and then you’ll have access to a fullscreen version of the Messaging client.

Use a Bot

If you haven’t interacted with a chatbot before, it’s not really different than chatting with a friend. You use a chatbot from within Messenger, but instead of a person, it’s a computer program running artificial intelligence to compose its messages to you. Not sure where to start? The site botlist.co lists a number of the different bots available (there are a lot of them). You can also find popular ones by just typing what you’re looking for in the To field when you start a new message. If Facebook can identify what you’re looking for, then it will autofill the To section for you with the appropriate bot. Some enjoyable bots to use are:

TODAY Food: Stay up to date on the latest food news and find quick recipes. Skyscanner: Let Skyscanner’s Messenger bot help you find a flight for your next big vacation.  Boost: Need a little pick me up? The Boost bot will offer you motivational sayings on demand to help keep you going.

Have Secret Chats

Sometimes you want to make sure the conversation you’re having with a friend really is private. While Facebook arguably isn’t the best place to send anyone sensitive information, the social network rolled out a way to have encrypted conversations on the platform. Secret conversations are encrypted from end-to-end, and can only be read by you and your recipient. Not even Facebook will be able to access what they contained. To activate the feature, compose a new message using the iOS or Android app. At the top right of the page, you’ll see a Secret option on iOS or a lock icon on Android. A timer box will then appear that allows you to set a time limit on viewing the message should you want to do so. For instance, you could make a photo self-destruct after just 10 seconds. Keep in mind that even if the photo does self-destruct, nothing is stopping anyone from taking a picture of the screen while the photo is displayed.

Send Cash for Free

At some point or another, we all have to send cash to a friend. Whether you’re reimbursing someone for your half of lunch, concert tickets, or just want to treat them to a beer from far away—figuring out how to send a friend cash can sometimes be challenging. Well, now you can actually send cash to your friends using Facebook for free. To do so, open the menu and then click the dollar sign at the bottom of the Messenger window with that person. From there you can specify the amount you’d like to send (you’ll need to also connect a debit card to Facebook). When you send cash, that money will be debited from your account and deposited in your friend’s account provided he or she has also tied their debit card to Facebook.

Send Files (Without Email)

Just like you might send an attachment via email, you can attach files to a Facebook Messenger message and send them to friends. If you’ve accessed Facebook Messenger via the web, either through Facebook’s website or the dedicated Messenger site, then you can upload a file by clicking the paperclip or file icon at the bottom of the display. Files you transfer have to be under 25MB in size. That’s the same requirement you’re given when attaching files to email messages in Gmail; however, in the case of Gmail, you’re able to attach Google Drive files that are considerably larger.

Make Free International Calls

Regardless of where your family or friends reside (or you for that mattter), Facebook lets you place a video or audio call to anyone on your friend’s list. That means that you can video chat with your uncle in Wales or your bestie that’s studying abroad in Japan for free. Keep in mind, this will use data rather than cell minutes, so you’ll likely want to be connected to Wi-Fi before you dial.

Change Your Facebook Chat Color

You can change the color of each conversation you have within Facebook Messenger. So, your husband could be red, kids yellow, and best friend purple. It seems simple, but if you routinely talk to several people at once using Messenger, it can be a great way to keep things organized and make sure you’re sending that kissy-face emoji to your boyfriend, not a friend from high school. To change the color of your conversation, click the information icon at the top of the chat window or if you’re using Facebook.com in a web browser, you can click the person’s name at the top of the chat box to change the color. On messenger.com choose Change Theme to pick a color, and on the Messenger app, tap Theme and then select the color you would like the text in your conversations to show up as going forward. The color change will be visible to both you and the person on the other end of the chat.

Send a Million Hearts

When you send a heart within Facebook Messenger, you’re not just sending one heart, you’re sending hundreds. Give it a try. Send the heart emoji to a loved one using Messenger and then keep your eyes on the chat window. A few seconds later, dozens of hearts will float up from the bottom of the screen. If you have the sound turned up on your device, you’ll also hear a bubble sound as they fly up, and just like balloons, you can catch them if you move fast enough. Try grabbing a few with your finger on their way up! Yeah, it’s true that this doesn’t make you more productive, but both you and the recipient will feel better. And, hey, it’s fun, too.

Change Your Default Facebook Chat Emoji

Facebook Messenger defaults to having a thumbs up emoji as the prime emoji for each conversation, but you can change that. If you find yourself sending a friend the same emoji over and over again on Facebook, you can change that emoji to be the default one for your convo with that person. That means it will show up on the bottom right of the chat window where the thumbs up one was. The whole emoji keyboard is available for this feature, and it can be a fun way to spice up and personalize your chats. To make the change, you’ll need to be either using the mobile app or the Messenger website. Go into Options, and then select Change Emoji (on the Messenger app or in the Facebook chat window, this is just Emoji) from the available list. Keep in mind, this will change the default emoji for the person you’re chatting with as well.

Make Your Facebook Messenger Emojis Bigger

The side of emoji in Facebook Messenger is adjustable if you know where to look. In fact, there are actually a few different sizes of all of Facebook’s emoji’s available. To supersize your emoji, just press and hold it. The emoji will gradually grow on the screen. Let go to have it stay at that size and be sent to your friend. If you have the volume turned up on your phone or computer, then Facebook will play a sound effect along with the growing that sounds similar to a balloon filling with air. Just like a balloon, if you try to blow it up too big, the emoji will burst and you’ll need to try again.

Send Video Clips

Sometimes words or a still picture won’t be enough justice for your message. That’s where a video will come in handy. Within the Messenger app, just press and hold down the shutter button located at the bottom of the page to record a video. Videos can be up to 15 seconds in length. Once you’re done with the recording, you can add emojis and text to your video by clicking on the icons at the top right side of the page. When you’re done, click the arrow at the bottom right to select which friends you’d like to send your video creation to. You can also download your video using the arrow icon at the bottom left side of the screen. Once on your phone, you’ll be able to do things like upload it to your Facebook wall, post it on Twitter, or send the video via text to friends that don’t use Facebook Messenger.

Download More Facebook Messenger Stickers

Even though there are a lot of stickers included by default inside Facebook Messenger, it’s never enough, right? Luckily, you’re not limited to just the stickers provided within Facebook Messenger. To access the options, click the sticker emoji (the smiling face at the bottom of ​your chat window) and then press the plus or download button at the top right of the window. From there you’ll be able to see all the sticker packs available and select the ones you’d like to use.

See When Your Facebook Message Was Read

Sending the message is half the battle. Knowing the recipient has read it, is another. Just tap on the chat bubble within the iOS or Android app, and you’ll see if the message has been Seen. You can also see when a message was read when that person’s Facebook picture appears beside the message in question.