The Horde 2.0 mode in Gears of War 3 is comparable to KF in that you're fighting waves of enemies and there's a money system. Another cool little thing they introduced are optional, random challenges that pop up sometimes. You have to complete them in that wave. No penalty if you don't, but if you do you get free extra weapons sent to your base and a monetary reward.
Challenges include killing x amount of enemies in a time-window of 30 seconds, killing x amount of enemies with headshots or "executions", etc.
This introduces a bit of variety. You often have to coordinate with your team and you can't just play on with the same defensive structure as usual. It forces you into different play-styles, should you chose the challenge is worth the risk. And lastly, it makes waves that would otherwise be boring interesting.
Of course these challenges don't all fit into KF but I'm sure we can come up with a few KF specific ones that would be fun.
Kill x amount of clots with one explosion.
Kill x amount of Scrakes/Fleshpounds in a 10 second window.
At least one players must not take any damage.
Kill 3 Sirens before killing a single Clot.
At least one member of the team has to kill x specimens without moving.
etc.
The challenges pop up at the beginning of a wave (not every wave) and they're active for one wave. If they're completed there's a cash bonus in it that justifies the risk, if not, nothing happens.
Challenges include killing x amount of enemies in a time-window of 30 seconds, killing x amount of enemies with headshots or "executions", etc.
This introduces a bit of variety. You often have to coordinate with your team and you can't just play on with the same defensive structure as usual. It forces you into different play-styles, should you chose the challenge is worth the risk. And lastly, it makes waves that would otherwise be boring interesting.
Of course these challenges don't all fit into KF but I'm sure we can come up with a few KF specific ones that would be fun.
Kill x amount of clots with one explosion.
Kill x amount of Scrakes/Fleshpounds in a 10 second window.
At least one players must not take any damage.
Kill 3 Sirens before killing a single Clot.
At least one member of the team has to kill x specimens without moving.
etc.
The challenges pop up at the beginning of a wave (not every wave) and they're active for one wave. If they're completed there's a cash bonus in it that justifies the risk, if not, nothing happens.