Tips for those after the hard badge:
- I really suggest everybody to practice a bit on sandbox before to start campaign so you can understand what you are gonna face and how to cope with them.
- Save money for the uzi and a quake box.Then save again for the chainsaw if you can (with every upgrade it's the most awesome weapon, fast auto-reload and always good)
- Improve fireman at least to 20-30 on the first waves; then repair man to 10-15
- Like every 9 days there will be a new enemy.On day 9 the first jeep will appear,and on day 10 uzi and quake boxes won't be enough anymore.
- Walking cyborg are not this big problem.You should focus instead on flying jetpack man and helicopter.
- On day 18 first tank appear...Things gonna be hard,get ready...!
- Skip weapons:1st shotgun,flamethrower,quaker(omg so slow) Towers like:big fan (so useless) flamethrower and tesla (rocket launcher and laser are way better)
- If you stack 3 barrier towers you will have 94%
Hope it was helpful. Enjoy!
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