How to make level un/lock system?

How to make level un/lock system? Please write step by step.

http://lmgtfy.com/?q=how+to+make+a+level+unlock+system+in+unity

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We don’t write tutorials for you.

Ask a more specific question, and we’ll give you a helping hand.

If you want a tutorial… google for it.

i hear about player prefs var, but i dont know where need put on script.