| Cost | Wood | 200 |
| Minerals | 1200 |
| Parchment | 3 |
| Price Ratio | 1.15 |
| **Effects** | Unhappiness | -4.8% |
| Culture per Tick | +0.005 |
| Maximum Culture | +50 |
| Prerequisite |
| Writing |
Amphitheatres reduce the Unhappiness of each kitten by -4.8%. From 0 to 15 amphitheaters, they are additive (each new amphitheater is a 4.8% reduction). Above 15, they experience diminishing returns; the total reduction is given by 1 - 0.0625/(0.048*N - .5). Below is a chart of these values
| Amphitheatres |
Unhappiness Reduction |
| 1 |
4.8% |
| 2 |
9.6% |
| 3 |
14.4% |
| 4 |
19.2% |
| 15 |
72.0% |
| 16 |
76.7% |
| 17 |
80.2% |
| 18 |
82.8% |
| 19 |
84.8% |
| 20 |
86.4% |
| 21 |
87.7% |
| 22 |
88.8% |
| 23 |
89.7% |
| 24 |
90.4% |
| 25 |
91.1% |
| 26 |
91.6% |
| 27 |
92.1% |
| 28 |
92.6% |
| 29 |
93.0% |
| 30 |
93.4% |
| 35 |
94.7% |
| 40 |
95.6% |
| 45 |
96.2% |
| 50 |
96.7% |
| 55 |
97.1% |
| 60 |
97.4% |
| 65 |
97.6% |
| 70 |
97.8% |
| 75 |
98.0% |
| 80 |
98.1% |
| 90 |
98.4% |
| 100 |
98.5% |
| 200 |
99.3% |
| 300 |
99.6% |
| 400 |
99.7% |
| 600 |
99.8% |
| 1000 |
99.9% |