Sanity Test for Cutthroat Ninja

I have one major suggestion for reorganizing. How To Play should be before the card details. You could keep a brief section giving a high-level overview of the three card types, but the specific cards should be at the back of the rules.

Ok, but TGC doesn't allow games to be listed for younger children because of the possible necessity of product testing.

The thematic intro is rather weak. It tells who we are and what we're trying to do, but it doesn't really set the stage (Who are the cutthroat ninjas? Where/when are they? Why are they taking out targets?) What does building an attack list mean? Say this in a thematic, non-mechanical way.

Overall, a good summary with outline of play and objective.

"The goal is to be the Ninja with the most rewards at the end of the game.": This sentence is redundant.

Complete list with card counts.

Images of each type of card, front and back.

At some point it would be good to show diagrams of the cards where HP, reward value, and attack value are labeled.

"To determine the order of play, each player selects a Target card": "Selects" implies choice. If it's random, just say "draws."

Beginning the Round: "• Shuffle the Target cards and place them face-down.": Since people just drew Targets, you presumably have to collect them all again.

In a deck or fanned out? Also, I think this only happens once (not every round), so it should be in the prior section.

"The person to the dealer's left randomly selects a Target": If this is a deck, "...flips the top card of the Target deck face-up."

Not needed.

The gameplay rules, overall, are pretty explicit. A few clarifications would help.

Continuing the Round: The way this is written it is not entirely clear that the round ends immediately when a player has enough hits. If there were a step in Playing Your Turn that said "Check for Defeated Target" or something similar, it would be more clear.

"...so that all players can see the reward value.": Does this mean you have to keep them fanned out, or should you just be able to see the top card?

"Remember to include all defensive strategy cards in play when counting the Hits total of each player involved in joining forces.": This belongs with the details of that card, not in the flow of play.

Continuing the Game: "All playing cards": This has not been defined. "Collect all Attack and Strategy cards" is more clear.

Much of this section is repeated from Beginning the Round. Rather than doing so, just explain how the deal passes and say to begin a new round following the directions above.

The Cards:

There should be an exact definition of "attack" and "attack card" because most of the specific rules depend upon them. Do all the Attack Cards listed count as an Attack? How are Combos treated? It would be better to make a clear rule about Combos once rather than stating them in each specific card.

Combo Cards: How do we recognize a combo?

Poison Dart: One point per card? Does a combo count as one card or three for this rule?

Dragon Rage: "Double the damage dealt by the attack you played in the previous turn." It might not have been on the previous turn if you had to pass. What if your previous card was a Poison Dart?

"Increase the Target's HP by 5 for a single player: When you place this card in front of an opponent, they will need to inflict 5 extra hits to defeat the Mercenary": Is that the name of the card or something? Similarly with "the Hired Guards".

"Increase the Target's HP by 5 for all players:" State that it includes yourself (even though the color text implies that.)

"Swap 2 cards in any attack list:" I think this means only within one player's attack list, but it should be made explicit.

"Draw an extra card:" Does this happen right away, or is it on your next turn like the opponent losing a draw?

The one picture of the game in play is fine.

The tie-breaker should give the direction of setting the Crooked Merchant as the Target.

A few details are fuzzy, but for the most part it is comprehensible.

Separate strategy advice from rules. (Either eliminate it, add line breaks, or change the font/color.) For example, "<Rules>Choose one of your opponent’s attacks and put it in the discard pile. <Strategy>This can be helpful when your opponent plays..."

Incorrect possessives, for example: "Claim one of your opponent's [opponents'] eliminated Targets as your own. It is a great way to cut your opponents [opponent's] lead..."

There are a few run-on sentences, missing a period or "and".

Be consistent in capitalization of headers and key words.

Good.

Good.

Good.

Good.

The pictures that are there are very high quality.

You could additionally show some close-ups of cards.

Pretty good wording.

"...build up an attack list with enough hit points" is a jargony thing to say. "...accumulate powerful enough attacks" would be better.

"Choose the next target": You don't choose it, you reveal it.

The video has high production value. The voiceover and music are painfully stereotypical. I would seriously consider having it re-voiced without the "old wise Asian" vibe.