Was playing My Singing Monsters Dawn Of Fire, and I had around 137 diamonds (rare currency used for speeding things up) and I had the chance to gain 20 more, and all I had to do was cook some things and put them in a box. (I had only around 18 hours to do this) Of course I took up the offer, and I started cooking. I didn't have the right materials to cook the 3 mushroom pizzas I needed, so I went shopping, and bought the rest with coins. I had some stuff previously cooking, like coconut cheese, which I needed to make the pizzas. One pizza takes around 8 hours to cook, depending on the level of bakery you have. I made 3 pizzas, and realized I wasn't quite going to make the deadline, so I did the unthinkable. I spent diamonds to speed it up. Each pizza cost around 36 DIAMONDS to speed up, and I still needed to use those pizzas to make mushroom pizza. Each mushroom pizza took EVEN MORE DIAMONDS to speed up. I ended up spending a plethora of diamonds to, in total, speed up the coconut cheeses 3x, 2 mushroom pizzas, and 3 pizzas. In total, I wasted about 110 diamonds, ended up with only 27, and STILL DIDNT MAKE THE DEADLINE!

Edit: You are able to purchase diamond generators for about 800 diamonds each, and I had one. A high level generator can give you 20 diamonds about every day and a quarter. So for me, getting diamonds was not AS hard as it could've been. But I'm still here sitting with my head in my hands, thinking about where my life went wrong.