Lift a Cube Arm Upgrades: Observed Push-Up Times and Stats

Buying an arm upgrade in Lift a Cube shortens your push-up time, which raises reps per minute and therefore Strength gained per minute. This reference covers what arm purchases change, observed prices and push-up times from gameplay captures, community-estimated relative tier speeds, and how arms differ from rolled materials — it is not a complete list of every arm upgrade, since no official table exists.

What an arm upgrade changes

Arm purchases are the deterministic speed layer of the game. The first upgrade is sold at a green pad labeled "Buy better arms" for $30, and later pads continue the pattern. Key properties:

• Each tier replaces the previous arm's push-up rate; train speed purchases add a separate multiplier on top.
• Better arms compound directly into Strength per minute by cutting exercise duration.
• The shop offers no refunds — a purchase spends the coins and is confirmed to persist for the rest of the current session; cross-session carryover is not established.

Observed prices and displayed push-up times

These are isolated observations from gameplay recordings and web guides, transcribed as displayed at the time of capture — not a complete or official table:

Verify values against current in-game labels before relying on any single figure; balance changes can shift prices and times.

Relative arm-tier speeds (community estimates)

The developer has not published official tier names, prices, or speed values, and the arm shop does not display a numerical speed value next to each arm — tiers are ranked by visible rep animation speed. Two community label sets circulate; treat all values as estimates:

Community data reports push-up speed roughly triples from starter arms to Bicep Bands, and Shoulder Plates are described as the practical ceiling for players who do not spend Robux. These labels are community names, not official in-game names.

How to read push-up-time differences and buy sensibly

• Buy the cheapest tier that visibly raises your push-up speed; early arms pay for themselves fastest, and saving for an expensive tier costs reps at the old, slower rate.
• Before each purchase, divide the speed gain by the cost and compare with the next tier up. A cheap tier with a small but real bump often beats an expensive one with a similar gain.
• Skip mid tiers that cost noticeably more while adding only a small speed bump — unless waiting would stall training.
• Re-evaluate after every chest roll, because a material multiplier changes which tier is the best value; expensive late tiers make sense once a material multiplier is carrying your Strength.
• Arms stack with train speed upgrades and remain useful for the rest of the current session; even a small arm upgrade on top of a large material multiplier raises the effective total. Cross-session carryover is not established.
• Avoid cosmetic arm variants that do not change push-up speed.

Arms versus rolled arm materials

Arm upgrades and rolled arm materials are separate systems. Purchased arms set your base push-up rate (the exercise duration); materials rolled from the Arm Materials Chest are a random strength multiplier applied on top of push-up output — e.g., Sand Material at Common rarity with Strength 1.5x observed for $80, and rare-tier rolls around 3x for $4.5K. A better material multiplies strength per push-up but does not change the timer; buying an arm shortens the timer but does not multiply per-rep strength. Keep the two systems separate when comparing arm options, and check current in-game pad labels, prices, and timing displays before purchasing, since values here come from scattered observations rather than an official table.