What the Buck ending and 100% completion

What the Buck ends when you have destroyed $1 sextillion: an End It All button appears, Mr. Buck makes his last call, and the credits roll. confirmed A full 100% run, all 47 achievements, took one release-day player 2 hours 46 minutes of in-game time. confirmed You do not need every upgrade to see the ending, and since patch 1.0.1 you can still finish the last prestige nodes afterwards. confirmed

What the Buck ending: what you need

• The goal: Mr. Buck asks you to destroy $1 sextillion “as quickly as possible” in his first call. confirmed Version note: a pre-release review key said 100 quintillion; release builds say $1 sextillion. confirmed
• The button: once the total is reached, Mr. Buck tells you to “go ahead and end it all”, and an End It All button sits next to the end-shift button. confirmed
• The achievement: the ending unlocks the one hidden achievement, the 47th. Its API name is game_finished. confirmed

You can reach the ending with nodes left to buy. A forum player hit the ending 99% done, one prestige node short. reported

How long does What the Buck take to beat?

Run	Length	Version
Release-day 100% run with commentary	2 h 46 min in game (99-minute edited video)	1.0
Full-game 100% walkthrough, no commentary	111 min	1.0
Pre-release 100% longplay	131 min	review key
100% achievements longplay, no commentary	142 min	review key (uploaded 31 Oct)
Japanese launch-day full clear	35-minute edited video	1.0

So: plan on roughly two to three hours for everything, a bit less for the ending alone. confirmed The developer’s own recorded run used for Next Fest went “far into the late game” in about 80 minutes before looping. confirmed

The last stretch, step by step

1. Max both panels and keep them between shifts. The keep nodes (10, 15 and 40 PP) mean the final shifts start strong. confirmed
2. Finish the skill tree in one shift. That is also Nothing Left to Buy. confirmed
3. Buy Idle Hands and the Money Printer for the final shift. confirmed
4. Use Investment Papers to close the gap. The release-day player doubled his money several times with stocks: one trade paid 283 quintillion, and the next took him past the goal. confirmed See Investment Papers.
5. Press End It All.

What happens at the end (spoilers)

Mr. Buck tells you why he hired you to destroy his fortune. It is a short, sincere monologue about what chasing money cost him, and it ends with your payout waiting at the front desk. confirmed We do not reproduce the text; watch it in game. Afterwards your save stays, so you can finish anything you skipped.

100% checklist

• All nine panel upgrades maxed (Top of the Line).
• Every skill tree node in one shift (Nothing Left to Buy).
• Every prestige node (Board Member). Before 1.0.1 the post-ending shift price could make this impossible; now every shift from the ninth on costs 1 sextillion, or less with Market Maker. confirmed
• 50 Diamonds, 50 Collector Bills, 100 each of Golden, Electric and Explosive, fuel from 50 Fuel Bills.
• Totals: 100,000 bills, $1 billion earned, $100 million held at once, 700 Prestige Points, five shifts.
• One Hour: currently counts table time only. confirmed
• The ending.

Full conditions are on achievements.

After the ending

Patch 1.0.1 was made for exactly this: after the ending the shift price kept rising ×100, which locked out the last prestige nodes. Now it stops at 1 sextillion. confirmed If your post-ending shift still shows a huge price, let Steam download 1.0.1; the new price shows on the current shift. confirmed