Yasmin Subba, 16, Sha Tin College
I'd invent a Yolo (you only live once) app. Does it sound cheesy? Read on.
How it works: this app would have a database of random things to do. For example, 'go camping this weekend; ask your crush out; learn how to surf' or even 'quit the job you hate'. Every day, one random thing to do will pop up on the Yolo app and you'd have to do it.
The best thing about this app is that it's useful to anyone who can use it. If you're aged seven, instead of being bored at home, you could be out exploring a hiking trail. If you're 30, you should take up a new hobby so that you're always learning new things and meeting new people. If you're 80, you need not feel that you're too old to experience new things - you're still alive, so you should be making the most of it.
This might be a simple idea, but I think people really need to start living life the way they want to. I think the main problem is that people 'wish' that they could do something, but lack the encouragement and drive to follow through with their desires. I feel that, though it is small, an app could make a difference by providing people with a nudge in the direction towards happiness.
'You only live once' is an important concept to me (it was even mentioned in one of the past Brain Game rounds). Life is too precious to waste wishing you were somewhere else.
That's what Yolo is there to remind us, and a Yolo app would certainly help to keep us motivated.
Doris Lam, 15, St Margaret's Co-educational English Secondary and Primary School
Ever put your phone on silent and had a hard time finding it? If so, my new app would be perfect for you. I'm sure lots of people have experienced this problem before so if I could invent a new app, it would be called The Phone Searcher, targeting people who are as forgetful as I am.
The Cell Tracker app, which is similar to mine, allows people to track others' phones and see their location as long as you have downloaded the app in both phones. I really like that app. However, that's not how The Phone Searcher works. The first time you clicked in The Phone Searcher, it would tell you to record your voice in different pitches and with different words. You could later choose the favourite word that you recorded, for example, the one in the high-pitched voice. Afterwards, the app would tell you to pick a song from its playlist or from your phone.
Confused? Well, this is how it works. If you cannot find your phone, just calm down and scream the word you recorded. Your phone would detect your voice and play the song that you chose earlier at top volume, even if you turned your phone to silent.
The main idea for my app came from the Cell Tracker app. I was inspired by their idea of tracking down people's phones, which would really come in handy if your handset was stolen.
However, I changed the idea a bit as I thought it was quite creepy that everyone could find out where I was.
So I made The Phone Searcher different - you have to be in the same room as your phone. Now you no longer have to waste hours hunting around trying to find your phone.