Medium Mode Waves
This is the best grinding method for Newbies and it is the 2nd easiest mode in TTD
This is the view of the waves and when toilets spawn, so you can be prepared on any wave.
Simple Waves Explanation
Early Game Waves (1-15) - Difficulty: EZ PZ - Easy
Mid Game Waves (15-25) - Difficulty: Easy
Late Game Waves (25-30) - Difficulty: Easy-Medium
Wave 1 - Small Toilets Spawns and Normal Toilets (0.001% Chance of Losing)
Wave 2 - Small Toilets Spawns (0.001% Chance of Losing)
Wave 3 - Small Toilets and Normal Toilets Spawns (0.002% Chance of Losing)
Wave 4 - Like Wave 3 (0.02% Chance of Losing)
Wave 5 - More Spawned Toilets that Spawns in Wave 1-4 (0.05% Chance of Losing)
Wave 6 - Spider Toilets Spawns
Wave 7 - Spider Toilets and Small Weak Toilets Spawn
Wave 8 - DJ Toilets and Spider Toilets
Wave 9 - Normal Toilet Spam and Spider Toilets
Wave 10 - Dual Claw Toilet Spawns and Spider Toilet and DJ Toilet Spam
Wave 11 - Police Toilet, Small Toilet, And Spider Toilets Spam.
Wave 12 - 2 Dual Claw Toilets and other weak toilets, With Large Toilet
Wave 13 - More Large Toilets and Spider Toilets
Wave 14 - More Toilets Spam wave
Wave 15 - Minigun Toilet Comes, And Vaccum Toilet and Boss Toilet
Wave 16-19 - More Toilet Spam (With Dual Claw Toilet and Mingun Toilets) (With Large Toilets)
Wave 18 - Another Boss Toilet
Wave 20 - Weak Units Spam, Large Toilets, 2 Boss Toilet, and 2 Vacuum Toilets
Wave 21-25 - Boss Toilets, Mutant Toilets Spawns more often here.
Wave 21 & 24 - Toilet Spawn rate Increased
Wave 24 - Jetpack Police Toilet Spawns
Wave 25 - More Boss Toilets and 2 Vaccum Toilet Spawns
Wave 26-29 - Large Toilets, Mutant Toilets, Boss Toilets, Some Stun Units, And Weak units spawns 100% in this waves
Wave 30 - Final Wave (Boss: Boss Toilet 2.0, He can stun) With Giant Glass Toilets and Strong Toilets.