As part of its MAR10 day update, the portable Nintendo game Super Mario Run is adding a better approach to play that does not require purchasing the game. The official introduction of this change to bring Super Mario Rush to a bigger audience is good for those who want to get some Mario entertainment without spending money on it. Source: over 1 year ago

Asking if you should buy a game now or wait for a sale isn't allowed, asking when a game will go on sale is not allowed, asking how big of a discount a game might get is not allowed. Use SteamDB to look at sale histories on games. Source: 6 months ago

Here's how to cure you from your buying habit, checkout https://steamdb.info/, check the price history of the game you're thinking of getting. Most likely it's on sale once every odd month, and discount percentages are only ever increasing over time. So really you can just buy it when you think you have time to play it soon. Source: 6 months ago

Correct, it's trending on https://steamdb.info/ if you look at the panel, some games will show zero players. But OP is wrong, other games are trending too. Source: 6 months ago

Asking if you should buy a game now or wait for a sale isn't allowed & asking when a game will go on sale is not allowed. Use SteamDB to look at sale histories on games. Source: 6 months ago

You can use the Steam console to download older versions as described here. You can get the depot and manifest IDs from SteamDB. Source: 6 months ago