How to level up

Only one way. Make giveaways. Successful giveaways for non-zero CV games lets you level up.

If you want to know how or what exactly does that mean or the finer details, please read the FAQ

Also the higher your level only means you get to enter higher level giveaways not that in lower or non level giveaways you'd have a better chance of winning them than a person on 0 level or a level less than yourself

If i would get each time 10 cents when i read such a question, i would be rich till now.

And to you as answer:
READ THE FAQ and RULES!
Why do you think sites create them ?

Easier would be buying lego bundle on your own, cause you would need to buy games to others to level up and levels don't guarant you win increase.

level up ????????????????????????????????????????????????????

Just buy this instead
https://www.humblebundle.com/games/lego-worlds-collide-ultimate-assembly?hmb_source=&hmb_medium=product_tile&hmb_campaign=mosaic_section_1_layout_index_1_layout_type_threes_tile_index_3_c_legoworldscollideultimateassembly_bundle

Reduce the enemies hp to 0 while keeping yours above 0.