When the going gets tough...

"Win 10 games on Hard difficulty in Co-op mode"

- In-game description

'When the going gets tough... ' is an achievement introduced in the Version 11.0 update for Bloons TD 6. To complete 'When the going gets tough...', the player is required to complete 10 different games successfully in Co-op mode on Hard difficulty. The rewards the player gets for completing 'When the going gets tough...' are 200 and x2 Super Monkey Storms.

Summary
'When the going gets tough...' is an easy achievement to complete, but requires players to be Level 20 due to the achievement being Co-op exclusive. The amount of players the player plays with doesn't matter, all that matters is that the player wins 10 games on Hard difficulty, what track the player picks also doesn't matter for this achievement. The rewards for completing this achievement are pretty nice, since Super Monkey Storms can be expensive for newer players and the 200 Monkey Money is a nice reward to go along with the small Monkey Money gained from completing 10 Hard games in Co-op mode.

Tips

 * It's recommended for the player to play with friends for better communication, as playing with randoms may be hard for the player to deal with.
 * If the player cannot play with anyone at the moment, the player can try to play 2 Player Co-op with a random.
 * Beginner maps and Intermediate maps are better for the player to play on if they're playing with randoms, due to the possibility the lobby is full of newer players, which can cause playing on an Advanced or Expert map to lead to disaster.