Back in the day, 3dfx was like magic. I had a PC with the horrible S3 Virge card and when I got a cheap 3dfx card, suddenly my old PC was good enough to play the newest games smoothly!

Use more oil, butter and sugar.

Potatoes are not ideal when trying to gain weight, is pasta / noodles so much more expensive? If so, buy flour and mix it with 1 egg per 100g and add some water or milk. Cook chunks of it in salted water.

Try to get your hands on the cheapest nuts you can find and eat as much as you can.