Icon set for educational website

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This customer received 24 icon designs from 8 designers. They chose this icon design from INKKO as the winning design.
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Hi! For an educational website where children can learn more about cyber security I would love to have a unique set of icons / graphics. On the frontpage, they can choose between a site about foxes (with a fox icon) and a Capture the Flag challenge (flag icon). When registering, the user is able to choose a team icon (up to 5-6 choices). When logged in, 4 categories are shown (hacking, forensics, cryptography and coding). When needed, the user can buy a hint (picture with the ?-sign in a box). For one of the challenges kids need to find out a secret code in an image (picture of foot step). Kids that participate on this CTF are aged between 12-15. I'm looking for a set of icons / graphics that are in the same style. At the moment I use a free icon set, but something more unique would be awesome. The flag icon will be used also for social media :). I prefer a flat design, with icons that are not included in circles or other shapes. Use your creativity, I'm looking forward to it!
Updates
Need extra days to review
Target Market(s)
Children between 12-15.
Colors
Designer to choose colors to be used in the design.
Look and feel
Each slider illustrates characteristics of the customer's brand and the style your logo design should communicate.
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Colorful
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Economical
Upmarket
Requirements
Must have
- Attractive looking, colourful icons. Simple, so children see what they stand for (hacking, cryptography, forensic investigation or coding). Use the supplied pictures as basis :). Flat icons, no background, no shapes as background.
- Colors: #158CBA, #f0f0f0, #28B62C, #75CAEB, #FF851B, #FF4136
- Flat design with rounded corners preferred
- For the hacking, forensics, crypto and coding icon: same size for all
Should not have
- Text in icons, unless it's some characters for the coding icon for example.